Keeping our body fit and healthy is one of the Keeping our body fit and healthy is one of the Keeping our body fit and healthy is one of the Keeping our body fit and healthy is one of the most important things that we have to do in our most important things that we have to do in our most important things that we have to do in our most important things that we have to do in our lives. We do this by exercising, While lives. We do this by exercising, While lives. We do this by exercising, While lives. We do this by exercising, While we we we we

exercise important exercise important exercise important exercise important body systems body systems body systems body systems are involvedare involvedare involvedare involved, , , , Like our Circulatory system, Respiratory Like our Circulatory system, Respiratory Like our Circulatory system, Respiratory Like our Circulatory system, Respiratory

system and Muscular system.system and Muscular system.system and Muscular system.system and Muscular system.

RespiraRespiraRespiraRespiratory Systemtory Systemtory Systemtory System The first system that is included in what The first system that is included in what The first system that is included in what The first system that is included in what happens to our body when we exercise is the happens to our body when we exercise is the happens to our body when we exercise is the happens to our body when we exercise is the Respiratory System.Respiratory System.Respiratory System.Respiratory System. WeWeWeWe humans breathe humans breathe humans breathe humans breathe

automatically all the automatically all the automatically all the automatically all the time. We breathe while we time. We breathe while we time. We breathe while we time. We breathe while we eat, while we sleep and while we play. eat, while we sleep and while we play. eat, while we sleep and while we play. eat, while we sleep and while we play.

Breathing is essential.Breathing is essential.Breathing is essential.Breathing is essential.

BreathinBreathinBreathinBreathingggg Firstly we breathe in oxygen this is called Firstly we breathe in oxygen this is called Firstly we breathe in oxygen this is called Firstly we breathe in oxygen this is called inhaling and when we breathe out it is called inhaling and when we breathe out it is called inhaling and when we breathe out it is called inhaling and when we breathe out it is called

exhaling.exhaling.exhaling.exhaling.

After thatAfter thatAfter thatAfter that,,,, oxygenoxygenoxygenoxygen goes down your trachea. The goes down your trachea. The goes down your trachea. The goes down your trachea. The trachea is a wind pipe that is connected from trachea is a wind pipe that is connected from trachea is a wind pipe that is connected from trachea is a wind pipe that is connected from your nose and mouth to your lungs. Your your nose and mouth to your lungs. Your your nose and mouth to your lungs. Your your nose and mouth to your lungs. Your

trachea travels oxygtrachea travels oxygtrachea travels oxygtrachea travels oxygen to your lungs. Inside en to your lungs. Inside en to your lungs. Inside en to your lungs. Inside your trachea are tiny hairs your trachea are tiny hairs your trachea are tiny hairs your trachea are tiny hairs called cilia. called cilia. called cilia. called cilia. These These These These tiny hairs move gently to catch mucus and dirt.tiny hairs move gently to catch mucus and dirt.tiny hairs move gently to catch mucus and dirt.tiny hairs move gently to catch mucus and dirt.

As we breathe weAs we breathe weAs we breathe weAs we breathe we use a muscle called the use a muscle called the use a muscle called the use a muscle called the

diaphragm, the diaphragm is the muscle that diaphragm, the diaphragm is the muscle that diaphragm, the diaphragm is the muscle that diaphragm, the diaphragm is the muscle that makes us breathe. The diaphragm is located makes us breathe. The diaphragm is located makes us breathe. The diaphragm is located makes us breathe. The diaphragm is located under under under under our lungs and it is a dome shaped our lungs and it is a dome shaped our lungs and it is a dome shaped our lungs and it is a dome shaped muscle. It contracts (flattens out) when we muscle. It contracts (flattens out) when we muscle. It contracts (flattens out) when we muscle. It contracts (flattens out) when we

breathe in it expands your lungs to make room breathe in it expands your lungs to make room breathe in it expands your lungs to make room breathe in it expands your lungs to make room for oxygen. It also relaxes when you exhale andfor oxygen. It also relaxes when you exhale andfor oxygen. It also relaxes when you exhale andfor oxygen. It also relaxes when you exhale and the lungs deflate to push carbon dioxide out.the lungs deflate to push carbon dioxide out.the lungs deflate to push carbon dioxide out.the lungs deflate to push carbon dioxide out.

LungsLungsLungsLungs

After oxygen goes down your traAfter oxygen goes down your traAfter oxygen goes down your traAfter oxygen goes down your trachea it enters chea it enters chea it enters chea it enters your lungs. Your lungs are pink and squishy. your lungs. Your lungs are pink and squishy. your lungs. Your lungs are pink and squishy. your lungs. Your lungs are pink and squishy.

The left lung is smaller than your right lung The left lung is smaller than your right lung The left lung is smaller than your right lung The left lung is smaller than your right lung to make room for your heart. Your lungs are to make room for your heart. Your lungs are to make room for your heart. Your lungs are to make room for your heart. Your lungs are protected by your rib cage. Your rib cage is protected by your rib cage. Your rib cage is protected by your rib cage. Your rib cage is protected by your rib cage. Your rib cage is made out of 12 sets of ribs. The lungs are made out of 12 sets of ribs. The lungs are made out of 12 sets of ribs. The lungs are made out of 12 sets of ribs. The lungs are

located inside ylocated inside ylocated inside ylocated inside your chest and rest on top of your our chest and rest on top of your our chest and rest on top of your our chest and rest on top of your diaphragm.diaphragm.diaphragm.diaphragm.

The next part in the respiratory system is the The next part in the respiratory system is the The next part in the respiratory system is the The next part in the respiratory system is the bronchus. Your trachea splits into two, one goes bronchus. Your trachea splits into two, one goes bronchus. Your trachea splits into two, one goes bronchus. Your trachea splits into two, one goes to each lung. This is called your bronchus. to each lung. This is called your bronchus. to each lung. This is called your bronchus. to each lung. This is called your bronchus. Your bronchus Your bronchus Your bronchus Your bronchus is the main tube to your lungs.is the main tube to your lungs.is the main tube to your lungs.is the main tube to your lungs.

The next part of your lThe next part of your lThe next part of your lThe next part of your lungs is the bronchioles. ungs is the bronchioles. ungs is the bronchioles. ungs is the bronchioles. Your bronchioles connect to your bronchus. The Your bronchioles connect to your bronchus. The Your bronchioles connect to your bronchus. The Your bronchioles connect to your bronchus. The bronchioles are tiny tubes the size of a hair bronchioles are tiny tubes the size of a hair bronchioles are tiny tubes the size of a hair bronchioles are tiny tubes the size of a hair that keep getting smaller and smaller. There that keep getting smaller and smaller. There that keep getting smaller and smaller. There that keep getting smaller and smaller. There are 30,000 bronchioles in each lung.are 30,000 bronchioles in each lung.are 30,000 bronchioles in each lung.are 30,000 bronchioles in each lung.

There is a clump at the end of each bronchiole. There is a clump at the end of each bronchiole. There is a clump at the end of each bronchiole. There is a clump at the end of each bronchiole. These cThese cThese cThese clumps are called alveoli. There lumps are called alveoli. There lumps are called alveoli. There lumps are called alveoli. There are are are are

600,000,000 alveoli’s in each lung. Alveoli’s 600,000,000 alveoli’s in each lung. Alveoli’s 600,000,000 alveoli’s in each lung. Alveoli’s 600,000,000 alveoli’s in each lung. Alveoli’s are teeny tiny air sacs. are teeny tiny air sacs. are teeny tiny air sacs. are teeny tiny air sacs. That fillsThat fillsThat fillsThat fills up with air up with air up with air up with air when you breathe when you breathe when you breathe when you breathe in.in.in.in. As the alveoli fill up with As the alveoli fill up with As the alveoli fill up with As the alveoli fill up with oxygen your lungs get bigger. They allow oxygen your lungs get bigger. They allow oxygen your lungs get bigger. They allow oxygen your lungs get bigger. They allow oxygen to pass to the blood. Your oxygen to pass to the blood. Your oxygen to pass to the blood. Your oxygen to pass to the blood. Your alalalalveoli areveoli areveoli areveoli are

surrounded by blood vessels called capillaries.surrounded by blood vessels called capillaries.surrounded by blood vessels called capillaries.surrounded by blood vessels called capillaries.

BloodBloodBloodBlood Blood and blood vesselsBlood and blood vesselsBlood and blood vesselsBlood and blood vessels are also a part of the are also a part of the are also a part of the are also a part of the respiratory system. The capillaries transport respiratory system. The capillaries transport respiratory system. The capillaries transport respiratory system. The capillaries transport blood around the body and are so small that blood around the body and are so small that blood around the body and are so small that blood around the body and are so small that

they enter the blood vessels in single file. they enter the blood vessels in single file. they enter the blood vessels in single file. they enter the blood vessels in single file. Oxygen iOxygen iOxygen iOxygen is transferred from your blood to your s transferred from your blood to your s transferred from your blood to your s transferred from your blood to your oxygen cells. Carbon dioxide is transferred oxygen cells. Carbon dioxide is transferred oxygen cells. Carbon dioxide is transferred oxygen cells. Carbon dioxide is transferred into your lungs to breathe out.into your lungs to breathe out.into your lungs to breathe out.into your lungs to breathe out.

ExerciseExerciseExerciseExercise

While you’re exercising your body accelerates While you’re exercising your body accelerates While you’re exercising your body accelerates While you’re exercising your body accelerates and needs more oxygen so it breathes faster and needs more oxygen so it breathes faster and needs more oxygen so it breathes faster and needs more oxygen so it breathes faster and deeper. You breathe in 3L of oxygen orand deeper. You breathe in 3L of oxygen orand deeper. You breathe in 3L of oxygen orand deeper. You breathe in 3L of oxygen or more, 50 times or more a minute while you’re more, 50 times or more a minute while you’re more, 50 times or more a minute while you’re more, 50 times or more a minute while you’re exercising. exercising. exercising. exercising. ThisThisThisThis is happening because your is happening because your is happening because your is happening because your body needs more oxygen, to dispose of carbon body needs more oxygen, to dispose of carbon body needs more oxygen, to dispose of carbon body needs more oxygen, to dispose of carbon

dioxide.dioxide.dioxide.dioxide.

The Circulatory SystemThe Circulatory SystemThe Circulatory SystemThe Circulatory System While we excercise we use a muscle called the While we excercise we use a muscle called the While we excercise we use a muscle called the While we excercise we use a muscle called the heart. The heart is part of the circulatorheart. The heart is part of the circulatorheart. The heart is part of the circulatorheart. The heart is part of the circulatory y y y system, the circulatory system pumps system, the circulatory system pumps system, the circulatory system pumps system, the circulatory system pumps

oxygenated blood around the body and dispose oxygenated blood around the body and dispose oxygenated blood around the body and dispose oxygenated blood around the body and dispose of waste.of waste.of waste.of waste.

HeartHeartHeartHeart

The heart is one of the most important organs The heart is one of the most important organs The heart is one of the most important organs The heart is one of the most important organs in the circulator system.in the circulator system.in the circulator system.in the circulator system. It is located inside It is located inside It is located inside It is located inside your chest, so it is closer to all your important your chest, so it is closer to all your important your chest, so it is closer to all your important your chest, so it is closer to all your important

organs. It iorgans. It iorgans. It iorgans. It is also easier to pump blood to your s also easier to pump blood to your s also easier to pump blood to your s also easier to pump blood to your upper body and your rib cage provides some upper body and your rib cage provides some upper body and your rib cage provides some upper body and your rib cage provides some protection for your heart. Your left lung is protection for your heart. Your left lung is protection for your heart. Your left lung is protection for your heart. Your left lung is

smaller than your right to make room for your smaller than your right to make room for your smaller than your right to make room for your smaller than your right to make room for your heart. The heart is behind your left lung.heart. The heart is behind your left lung.heart. The heart is behind your left lung.heart. The heart is behind your left lung.

Your heart is the size of your clenched fiYour heart is the size of your clenched fiYour heart is the size of your clenched fiYour heart is the size of your clenched fist and st and st and st and it is also a hollow bag. Your heart is known as it is also a hollow bag. Your heart is known as it is also a hollow bag. Your heart is known as it is also a hollow bag. Your heart is known as the cardiac muscle. It is made up of muscle the cardiac muscle. It is made up of muscle the cardiac muscle. It is made up of muscle the cardiac muscle. It is made up of muscle fibers the muscle fibers are spirals insfibers the muscle fibers are spirals insfibers the muscle fibers are spirals insfibers the muscle fibers are spirals insttttead of ead of ead of ead of

straightstraightstraightstraight, to make the heart stronger., to make the heart stronger., to make the heart stronger., to make the heart stronger.

The heart has 4 chambers. It has a left side The heart has 4 chambers. It has a left side The heart has 4 chambers. It has a left side The heart has 4 chambers. It has a left side and a right side. The lefand a right side. The lefand a right side. The lefand a right side. The left atrium receives t atrium receives t atrium receives t atrium receives

oxygenated blood from the lungs. After that is oxygenated blood from the lungs. After that is oxygenated blood from the lungs. After that is oxygenated blood from the lungs. After that is the biscupid valve,(it is the valve between the the biscupid valve,(it is the valve between the the biscupid valve,(it is the valve between the the biscupid valve,(it is the valve between the atrium and ventricle) it allows blood to the atrium and ventricle) it allows blood to the atrium and ventricle) it allows blood to the atrium and ventricle) it allows blood to the ventricle. The left ventricle pups blood to the ventricle. The left ventricle pups blood to the ventricle. The left ventricle pups blood to the ventricle. The left ventricle pups blood to the aorta, which sends it around the body.aorta, which sends it around the body.aorta, which sends it around the body.aorta, which sends it around the body.

After thatAfter thatAfter thatAfter that is the right atrium, it receives is the right atrium, it receives is the right atrium, it receives is the right atrium, it receives

deoxygenated blood from the body to send to the deoxygenated blood from the body to send to the deoxygenated blood from the body to send to the deoxygenated blood from the body to send to the lungs. Next is the tricuspid valve (it is the lungs. Next is the tricuspid valve (it is the lungs. Next is the tricuspid valve (it is the lungs. Next is the tricuspid valve (it is the valve between the atrium and ventricle) it valve between the atrium and ventricle) it valve between the atrium and ventricle) it valve between the atrium and ventricle) it allows blood into the ventricle from the allows blood into the ventricle from the allows blood into the ventricle from the allows blood into the ventricle from the

atrium. The right atrium pumps blood to the atrium. The right atrium pumps blood to the atrium. The right atrium pumps blood to the atrium. The right atrium pumps blood to the pulmonary pulmonary pulmonary pulmonary artoryartoryartoryartory, which sends it to the lungs , which sends it to the lungs , which sends it to the lungs , which sends it to the lungs

to receive oxygen.to receive oxygen.to receive oxygen.to receive oxygen.

The next part of the heart is the nerves. One of The next part of the heart is the nerves. One of The next part of the heart is the nerves. One of The next part of the heart is the nerves. One of the nerves is called the symperthtic nerve,the nerves is called the symperthtic nerve,the nerves is called the symperthtic nerve,the nerves is called the symperthtic nerve, it it it it receives impulses from the brain to tell the receives impulses from the brain to tell the receives impulses from the brain to tell the receives impulses from the brain to tell the heart to beat. It also tells the heart rate and heart to beat. It also tells the heart rate and heart to beat. It also tells the heart rate and heart to beat. It also tells the heart rate and fffforces the heart beat to increase when it is orces the heart beat to increase when it is orces the heart beat to increase when it is orces the heart beat to increase when it is

needed. Next is the parasympathetic nerve, it is needed. Next is the parasympathetic nerve, it is needed. Next is the parasympathetic nerve, it is needed. Next is the parasympathetic nerve, it is part of the breaking system. The part of the breaking system. The part of the breaking system. The part of the breaking system. The

parasympathetic tells the system to slow down parasympathetic tells the system to slow down parasympathetic tells the system to slow down parasympathetic tells the system to slow down when it is needed. The heart is part of the when it is needed. The heart is part of the when it is needed. The heart is part of the when it is needed. The heart is part of the

automatic system. The automatic system automatic system. The automatic system automatic system. The automatic system automatic system. The automatic system works works works works automatically with out thought.automatically with out thought.automatically with out thought.automatically with out thought.

3 circulations3 circulations3 circulations3 circulations

Inside our body we have 3 circulations. One of Inside our body we have 3 circulations. One of Inside our body we have 3 circulations. One of Inside our body we have 3 circulations. One of them is called them is called them is called them is called coronarycoronarycoronarycoronary circulation. Coronary circulation. Coronary circulation. Coronary circulation. Coronary circulation is the circulation of blood to the circulation is the circulation of blood to the circulation is the circulation of blood to the circulation is the circulation of blood to the cardiac muscle (the heart).The heart is a cardiac muscle (the heart).The heart is a cardiac muscle (the heart).The heart is a cardiac muscle (the heart).The heart is a

muscle that never smuscle that never smuscle that never smuscle that never stops working until you die. tops working until you die. tops working until you die. tops working until you die. The heart needs oxygen and The heart needs oxygen and The heart needs oxygen and The heart needs oxygen and nutrients. The nutrients. The nutrients. The nutrients. The

coronarycoronarycoronarycoronary vessels carry blood around the heart. vessels carry blood around the heart. vessels carry blood around the heart. vessels carry blood around the heart.

CoronaryCoronaryCoronaryCoronary circulation also carries waste away circulation also carries waste away circulation also carries waste away circulation also carries waste away from the hearts muscle.from the hearts muscle.from the hearts muscle.from the hearts muscle.

Next is pulmonary circulation. Pulmonary Next is pulmonary circulation. Pulmonary Next is pulmonary circulation. Pulmonary Next is pulmonary circulation. Pulmonary circulation carries blood tocirculation carries blood tocirculation carries blood tocirculation carries blood to and from the and from the and from the and from the

lungs. After that is lungs. After that is lungs. After that is lungs. After that is bronchiolebronchiolebronchiolebronchiole circulation, it circulation, it circulation, it circulation, it supplies blood to the tissues of supplies blood to the tissues of supplies blood to the tissues of supplies blood to the tissues of the larger the larger the larger the larger

airways in the lungs.airways in the lungs.airways in the lungs.airways in the lungs.

The last circulation is called systemic The last circulation is called systemic The last circulation is called systemic The last circulation is called systemic circulation. Systemic circulation sends blood circulation. Systemic circulation sends blood circulation. Systemic circulation sends blood circulation. Systemic circulation sends blood around the body. Blood travels by blood around the body. Blood travels by blood around the body. Blood travels by blood around the body. Blood travels by blood

vessels. It also supplies the body with oxygen vessels. It also supplies the body with oxygen vessels. It also supplies the body with oxygen vessels. It also supplies the body with oxygen and nutrients and takes waste away.and nutrients and takes waste away.and nutrients and takes waste away.and nutrients and takes waste away.

Blood vesselsBlood vesselsBlood vesselsBlood vessels

Next are blood vessels. Blood vessels take blood Next are blood vessels. Blood vessels take blood Next are blood vessels. Blood vessels take blood Next are blood vessels. Blood vessels take blood around the body. around the body. around the body. around the body. The firstThe firstThe firstThe first part of blood vessels part of blood vessels part of blood vessels part of blood vessels is called arteries. Arteries have 4layers. The is called arteries. Arteries have 4layers. The is called arteries. Arteries have 4layers. The is called arteries. Arteries have 4layers. The outer layer iouter layer iouter layer iouter layer is called tunica adventitia, s called tunica adventitia, s called tunica adventitia, s called tunica adventitia, it it it it

contains a nerve cells and blood vessels. contains a nerve cells and blood vessels. contains a nerve cells and blood vessels. contains a nerve cells and blood vessels. The The The The se se se se supply the vessels with oxygen and nutrients. supply the vessels with oxygen and nutrients. supply the vessels with oxygen and nutrients. supply the vessels with oxygen and nutrients. The tunicaThe tunicaThe tunicaThe tunica media is a muscular media is a muscular media is a muscular media is a muscular layer. The layer. The layer. The layer. The tunica media is thicker in arteries because of tunica media is thicker in arteries because of tunica media is thicker in arteries because of tunica media is thicker in arteries because of the pressure from the heart. This is whythe pressure from the heart. This is whythe pressure from the heart. This is whythe pressure from the heart. This is why it it it it

creates a higher blood pressure. The tunica creates a higher blood pressure. The tunica creates a higher blood pressure. The tunica creates a higher blood pressure. The tunica media is like an elastic band so it can move. media is like an elastic band so it can move. media is like an elastic band so it can move. media is like an elastic band so it can move. Then comes the tunica intimia which is the Then comes the tunica intimia which is the Then comes the tunica intimia which is the Then comes the tunica intimia which is the

inner lininginner lininginner lininginner lining layer of the arteries it is made out layer of the arteries it is made out layer of the arteries it is made out layer of the arteries it is made out of endothelia cells. After that is the lumen. The of endothelia cells. After that is the lumen. The of endothelia cells. After that is the lumen. The of endothelia cells. After that is the lumen. The lumen is the hollowlumen is the hollowlumen is the hollowlumen is the hollow centecentecentecenter of the arteries. The r of the arteries. The r of the arteries. The r of the arteries. The lumen of arteries is not as wide as lumen of arteries is not as wide as lumen of arteries is not as wide as lumen of arteries is not as wide as thethethethe lumen of lumen of lumen of lumen of veinsveinsveinsveins. This is how it creates higher pressure . This is how it creates higher pressure . This is how it creates higher pressure . This is how it creates higher pressure and it is also how blood travels quicker around and it is also how blood travels quicker around and it is also how blood travels quicker around and it is also how blood travels quicker around

the body.the body.the body.the body.

Capillaries are also blood vessels.Capilliaries Capillaries are also blood vessels.Capilliaries Capillaries are also blood vessels.Capilliaries Capillaries are also blood vessels.Capilliaries are small and they don’are small and they don’are small and they don’are small and they don’t have 3 tunica layers. t have 3 tunica layers. t have 3 tunica layers. t have 3 tunica layers. They only have one layer of endoilial cells. They only have one layer of endoilial cells. They only have one layer of endoilial cells. They only have one layer of endoilial cells.

Veins are aVeins are aVeins are aVeins are also a part of blood vessels. Veins lso a part of blood vessels. Veins lso a part of blood vessels. Veins lso a part of blood vessels. Veins are the same structure as arteries, but with are the same structure as arteries, but with are the same structure as arteries, but with are the same structure as arteries, but with some differences. The lumen is wider in blood some differences. The lumen is wider in blood some differences. The lumen is wider in blood some differences. The lumen is wider in blood vessels, because it is a low pressure system. Thvessels, because it is a low pressure system. Thvessels, because it is a low pressure system. Thvessels, because it is a low pressure system. The e e e tunica media is thiner and because thetunica media is thiner and because thetunica media is thiner and because thetunica media is thiner and because there is re is re is re is less pressure. Veins contain valves, the valves less pressure. Veins contain valves, the valves less pressure. Veins contain valves, the valves less pressure. Veins contain valves, the valves stop blood going in the wrong direction. Tstop blood going in the wrong direction. Tstop blood going in the wrong direction. Tstop blood going in the wrong direction. T he he he he valves act like a reservoir and they allow the valves act like a reservoir and they allow the valves act like a reservoir and they allow the valves act like a reservoir and they allow the

blood to pool. Veins have muscle pumps, which blood to pool. Veins have muscle pumps, which blood to pool. Veins have muscle pumps, which blood to pool. Veins have muscle pumps, which help blood along as thelp blood along as thelp blood along as thelp blood along as there is less pressure.here is less pressure.here is less pressure.here is less pressure.

Arteries and veins are white in the body. Veins Arteries and veins are white in the body. Veins Arteries and veins are white in the body. Veins Arteries and veins are white in the body. Veins under your skin appear blue because light under your skin appear blue because light under your skin appear blue because light under your skin appear blue because light can’t can’t can’t can’t penetrate through the skin. penetrate through the skin. penetrate through the skin. penetrate through the skin. Arteries and Arteries and Arteries and Arteries and veins appear red and blue in text books to show veins appear red and blue in text books to show veins appear red and blue in text books to show veins appear red and blue in text books to show

you the difference.you the difference.you the difference.you the difference.

Arteries are part of the Arteries are part of the Arteries are part of the Arteries are part of the arterial system. They arterial system. They arterial system. They arterial system. They are deep in the body so they can be protected. are deep in the body so they can be protected. are deep in the body so they can be protected. are deep in the body so they can be protected. They also transport oxygenated blood around They also transport oxygenated blood around They also transport oxygenated blood around They also transport oxygenated blood around and from the heart. High pressure is created and from the heart. High pressure is created and from the heart. High pressure is created and from the heart. High pressure is created by the heart and its by the heart and its by the heart and its by the heart and its pumping. An artery pumping. An artery pumping. An artery pumping. An artery will will will will squirt with every heart beat if you cut it. When squirt with every heart beat if you cut it. When squirt with every heart beat if you cut it. When squirt with every heart beat if you cut it. When youryouryouryour arteries become smaller they become arteries become smaller they become arteries become smaller they become arteries become smaller they become arterioles. Arteries are in the same place in arterioles. Arteries are in the same place in arterioles. Arteries are in the same place in arterioles. Arteries are in the same place in

every body.every body.every body.every body.

Capilliaries are also blood vessels. The arteries Capilliaries are also blood vessels. The arteries Capilliaries are also blood vessels. The arteries Capilliaries are also blood vessels. The arteries filter blood into the capillliaries.It deposits its filter blood into the capillliaries.It deposits its filter blood into the capillliaries.It deposits its filter blood into the capillliaries.It deposits its nutrients and oxygen to the body cells and they nutrients and oxygen to the body cells and they nutrients and oxygen to the body cells and they nutrients and oxygen to the body cells and they also tranalso tranalso tranalso transfer carbon dioxide out of the body. sfer carbon dioxide out of the body. sfer carbon dioxide out of the body. sfer carbon dioxide out of the body.

Veins are part of the venul system. They carry Veins are part of the venul system. They carry Veins are part of the venul system. They carry Veins are part of the venul system. They carry deoxygenated blood back to the heart andeoxygenated blood back to the heart andeoxygenated blood back to the heart andeoxygenated blood back to the heart and they d they d they d they have a lower pressure, so if you cut your self it have a lower pressure, so if you cut your self it have a lower pressure, so if you cut your self it have a lower pressure, so if you cut your self it will dribble. Veins keep getting bigger from will dribble. Veins keep getting bigger from will dribble. Veins keep getting bigger from will dribble. Veins keep getting bigger from capilliaries, first they becocapilliaries, first they becocapilliaries, first they becocapilliaries, first they become venuals and me venuals and me venuals and me venuals and then they become veins. Many veins just lie then they become veins. Many veins just lie then they become veins. Many veins just lie then they become veins. Many veins just lie under your skin. Minor veins vary from under your skin. Minor veins vary from under your skin. Minor veins vary from under your skin. Minor veins vary from

person to person. person to person. person to person. person to person.

Around your heart are blood vessels. One of Around your heart are blood vessels. One of Around your heart are blood vessels. One of Around your heart are blood vessels. One of them is called the pulmonary artery. The them is called the pulmonary artery. The them is called the pulmonary artery. The them is called the pulmonary artery. The

pulmonary artery carries deoxygenated blood pulmonary artery carries deoxygenated blood pulmonary artery carries deoxygenated blood pulmonary artery carries deoxygenated blood from tfrom tfrom tfrom the right ventricle to the lungs.he right ventricle to the lungs.he right ventricle to the lungs.he right ventricle to the lungs. The next The next The next The next one is called the pulmonary vein. The one is called the pulmonary vein. The one is called the pulmonary vein. The one is called the pulmonary vein. The

pulmonary vein carries oxygenated blood from pulmonary vein carries oxygenated blood from pulmonary vein carries oxygenated blood from pulmonary vein carries oxygenated blood from the lungs to the heart. One of the most the lungs to the heart. One of the most the lungs to the heart. One of the most the lungs to the heart. One of the most

important vessels in the heart is the aorta. The important vessels in the heart is the aorta. The important vessels in the heart is the aorta. The important vessels in the heart is the aorta. The aorta is the largest artery, it takes oxygaorta is the largest artery, it takes oxygaorta is the largest artery, it takes oxygaorta is the largest artery, it takes oxygenated enated enated enated blood from the left ventricle to the body. After blood from the left ventricle to the body. After blood from the left ventricle to the body. After blood from the left ventricle to the body. After that is the Vena Cava. The inferior Vena Cava that is the Vena Cava. The inferior Vena Cava that is the Vena Cava. The inferior Vena Cava that is the Vena Cava. The inferior Vena Cava and the superior vein are the 2 main veins. and the superior vein are the 2 main veins. and the superior vein are the 2 main veins. and the superior vein are the 2 main veins. The superior Vena Cava returns blood from the The superior Vena Cava returns blood from the The superior Vena Cava returns blood from the The superior Vena Cava returns blood from the upper body to upper body to upper body to upper body to the heart. The inferior Vena Cava the heart. The inferior Vena Cava the heart. The inferior Vena Cava the heart. The inferior Vena Cava returns blood returns blood returns blood returns blood from the lower body to the heart.from the lower body to the heart.from the lower body to the heart.from the lower body to the heart.

BloodBloodBloodBlood

Blood is one of the most important parts of our Blood is one of the most important parts of our Blood is one of the most important parts of our Blood is one of the most important parts of our Circulatory system. Blood heats our body, it Circulatory system. Blood heats our body, it Circulatory system. Blood heats our body, it Circulatory system. Blood heats our body, it takes heat from busier places like the heart, takes heat from busier places like the heart, takes heat from busier places like the heart, takes heat from busier places like the heart, lungs and liver and spreads it around the lungs and liver and spreads it around the lungs and liver and spreads it around the lungs and liver and spreads it around the

body evenly.body evenly.body evenly.body evenly.

Blood has 4 main paBlood has 4 main paBlood has 4 main paBlood has 4 main parrrrts. Red blood cells, white ts. Red blood cells, white ts. Red blood cells, white ts. Red blood cells, white blood cells , platelets and plasma. Red blood blood cells , platelets and plasma. Red blood blood cells , platelets and plasma. Red blood blood cells , platelets and plasma. Red blood cells make blood red and cells make blood red and cells make blood red and cells make blood red and they make half the they make half the they make half the they make half the volume of the blood. There are billions of them volume of the blood. There are billions of them volume of the blood. There are billions of them volume of the blood. There are billions of them in the blood, they transport things too, and they in the blood, they transport things too, and they in the blood, they transport things too, and they in the blood, they transport things too, and they carry oxygen to cells in the body. Tcarry oxygen to cells in the body. Tcarry oxygen to cells in the body. Tcarry oxygen to cells in the body. T heyheyheyhey also also also also

carry waste and carbon dioxide.carry waste and carbon dioxide.carry waste and carbon dioxide.carry waste and carbon dioxide.

White blood cells are the biggest cells in the White blood cells are the biggest cells in the White blood cells are the biggest cells in the White blood cells are the biggest cells in the body. They clean the blood and fight disease body. They clean the blood and fight disease body. They clean the blood and fight disease body. They clean the blood and fight disease

and germs.and germs.and germs.and germs.

Platelets are the smallest part of the blood. Platelets are the smallest part of the blood. Platelets are the smallest part of the blood. Platelets are the smallest part of the blood. There are billions of them and they help blood There are billions of them and they help blood There are billions of them and they help blood There are billions of them and they help blood

to clot when you cutto clot when you cutto clot when you cutto clot when you cut your self. your self. your self. your self.

PPPPlasma is a watery substance and the other lasma is a watery substance and the other lasma is a watery substance and the other lasma is a watery substance and the other parts float in it. Plasma is what makes blood a parts float in it. Plasma is what makes blood a parts float in it. Plasma is what makes blood a parts float in it. Plasma is what makes blood a liquid. It carries nutrients to cells and carries liquid. It carries nutrients to cells and carries liquid. It carries nutrients to cells and carries liquid. It carries nutrients to cells and carries waste to waste to waste to waste to the kidneys. It also carries body the kidneys. It also carries body the kidneys. It also carries body the kidneys. It also carries body control substances like hormones.control substances like hormones.control substances like hormones.control substances like hormones.

KidneysKidneysKidneysKidneys

The kidneys areThe kidneys areThe kidneys areThe kidneys are part of the urinary system but part of the urinary system but part of the urinary system but part of the urinary system but they are important to the circulatory system. they are important to the circulatory system. they are important to the circulatory system. they are important to the circulatory system. They clean the waste out of your blood and expel They clean the waste out of your blood and expel They clean the waste out of your blood and expel They clean the waste out of your blood and expel it from the body through urine. Every body is it from the body through urine. Every body is it from the body through urine. Every body is it from the body through urine. Every body is born with 2 kidneys, but you can live with one. born with 2 kidneys, but you can live with one. born with 2 kidneys, but you can live with one. born with 2 kidneys, but you can live with one. Your kidneys are located in your baYour kidneys are located in your baYour kidneys are located in your baYour kidneys are located in your back, below ck, below ck, below ck, below

the middle.the middle.the middle.the middle.

Inside your kidneys there are 100 000 tiny Inside your kidneys there are 100 000 tiny Inside your kidneys there are 100 000 tiny Inside your kidneys there are 100 000 tiny filters called nephronsfilters called nephronsfilters called nephronsfilters called nephrons. They also have a tube . They also have a tube . They also have a tube . They also have a tube called a ureter, this is the tube where waste called a ureter, this is the tube where waste called a ureter, this is the tube where waste called a ureter, this is the tube where waste

trickles to your bladder.trickles to your bladder.trickles to your bladder.trickles to your bladder.

ExerciseExerciseExerciseExercise While we exercise our circulatory system While we exercise our circulatory system While we exercise our circulatory system While we exercise our circulatory system accelerates andaccelerates andaccelerates andaccelerates and ourourourour heart pumps faster and heart pumps faster and heart pumps faster and heart pumps faster and harder. This is because it needs to pump blood harder. This is because it needs to pump blood harder. This is because it needs to pump blood harder. This is because it needs to pump blood

around our body quickly. The reason is because around our body quickly. The reason is because around our body quickly. The reason is because around our body quickly. The reason is because your body cells need more oxygen and your body cells need more oxygen and your body cells need more oxygen and your body cells need more oxygen and nutrients. Your body cells also dispose of nutrients. Your body cells also dispose of nutrients. Your body cells also dispose of nutrients. Your body cells also dispose of

more waste. more waste. more waste. more waste.

The muscular systemThe muscular systemThe muscular systemThe muscular system

The third system thaThe third system thaThe third system thaThe third system that operates while we exercise t operates while we exercise t operates while we exercise t operates while we exercise is called the muscular system, the muscles is called the muscular system, the muscles is called the muscular system, the muscles is called the muscular system, the muscles inside our body help us move. They also help inside our body help us move. They also help inside our body help us move. They also help inside our body help us move. They also help

our body function.our body function.our body function.our body function.

TypesTypesTypesTypes Inside our body there are three different types Inside our body there are three different types Inside our body there are three different types Inside our body there are three different types of muscles, Voluntary, Involuntary and of muscles, Voluntary, Involuntary and of muscles, Voluntary, Involuntary and of muscles, Voluntary, Involuntary and Cardiac. Skeletal muscleCardiac. Skeletal muscleCardiac. Skeletal muscleCardiac. Skeletal muscles are known as s are known as s are known as s are known as voluntary muscles. These muscles are very voluntary muscles. These muscles are very voluntary muscles. These muscles are very voluntary muscles. These muscles are very adaptable and are used in different situationsadaptable and are used in different situationsadaptable and are used in different situationsadaptable and are used in different situations like writing and exercising. They are connected like writing and exercising. They are connected like writing and exercising. They are connected like writing and exercising. They are connected to to to to bones,bones,bones,bones, for example the for example the for example the for example the biceps,biceps,biceps,biceps, triceps and triceps and triceps and triceps and thighs. They move thighs. They move thighs. They move thighs. They move with thought. This with thought. This with thought. This with thought. This happens happens happens happens bybybyby the bthe bthe bthe brain rain rain rain sending a signal telling the sending a signal telling the sending a signal telling the sending a signal telling the

muscle to move.muscle to move.muscle to move.muscle to move.

Next are involuntary musclesNext are involuntary musclesNext are involuntary musclesNext are involuntary muscles. Smooth muscles . Smooth muscles . Smooth muscles . Smooth muscles are alsoare alsoare alsoare also known asknown asknown asknown as involuntary muscles. They involuntary muscles. They involuntary muscles. They involuntary muscles. They move without conscious thought, they are move without conscious thought, they are move without conscious thought, they are move without conscious thought, they are controlled by the automatic nervous system. controlled by the automatic nervous system. controlled by the automatic nervous system. controlled by the automatic nervous system. This system helps vital body processThis system helps vital body processThis system helps vital body processThis system helps vital body process like the like the like the like the stomach, heastomach, heastomach, heastomach, heart and intestines work.rt and intestines work.rt and intestines work.rt and intestines work.

The next type of muscle is the heart (cardiac The next type of muscle is the heart (cardiac The next type of muscle is the heart (cardiac The next type of muscle is the heart (cardiac muscle). The heart is classified as an muscle). The heart is classified as an muscle). The heart is classified as an muscle). The heart is classified as an involuntary muscle and is smooth in the involuntary muscle and is smooth in the involuntary muscle and is smooth in the involuntary muscle and is smooth in the

insideinsideinsideinside. . . . HHHHowever it is like a skeletal muscle on owever it is like a skeletal muscle on owever it is like a skeletal muscle on owever it is like a skeletal muscle on the outside.the outside.the outside.the outside.

AppearanceAppearanceAppearanceAppearance

Different Different Different Different types of muscles have different types of muscles have different types of muscles have different types of muscles have different appearances. For example skeletal muscles appearances. For example skeletal muscles appearances. For example skeletal muscles appearances. For example skeletal muscles weigh half your bodies weight and there are weigh half your bodies weight and there are weigh half your bodies weight and there are weigh half your bodies weight and there are more thanmore thanmore thanmore than 640 of them inside your body. These 640 of them inside your body. These 640 of them inside your body. These 640 of them inside your body. These muscles are red in colour because blood is muscles are red in colour because blood is muscles are red in colour because blood is muscles are red in colour because blood is running through them, these muscles have running through them, these muscles have running through them, these muscles have running through them, these muscles have differendifferendifferendifferent layers, the first layer is just under t layers, the first layer is just under t layers, the first layer is just under t layers, the first layer is just under the skin it is called the superficial layer. Next the skin it is called the superficial layer. Next the skin it is called the superficial layer. Next the skin it is called the superficial layer. Next is the second is the second is the second is the second layer, this layer is deeper than the layer, this layer is deeper than the layer, this layer is deeper than the layer, this layer is deeper than the superficial layer. Some muscles have a third superficial layer. Some muscles have a third superficial layer. Some muscles have a third superficial layer. Some muscles have a third

layer called the medial layer.layer called the medial layer.layer called the medial layer.layer called the medial layer. Skeletal muscles Skeletal muscles Skeletal muscles Skeletal muscles have different shapeshave different shapeshave different shapeshave different shapes and sizes, but they are and sizes, but they are and sizes, but they are and sizes, but they are all all all all the same in the inside. Most muscles are the same in the inside. Most muscles are the same in the inside. Most muscles are the same in the inside. Most muscles are long and slim but some long and slim but some long and slim but some long and slim but some areareareare different shapes, different shapes, different shapes, different shapes, like your pectorals are fan shaped. Some like your pectorals are fan shaped. Some like your pectorals are fan shaped. Some like your pectorals are fan shaped. Some

muscles are wide and muscles are wide and muscles are wide and muscles are wide and broad,broad,broad,broad, for example for example for example for example the the the the abdominal wall is wide and broad it is shaped abdominal wall is wide and broad it is shaped abdominal wall is wide and broad it is shaped abdominal wall is wide and broad it is shaped

like flat like flat like flat like flat sheets of trianglesheets of trianglesheets of trianglesheets of trianglessss....

Interesting factsInteresting factsInteresting factsInteresting facts The appearance of muscles is quite interesting The appearance of muscles is quite interesting The appearance of muscles is quite interesting The appearance of muscles is quite interesting for example your gluteus maximus (your for example your gluteus maximus (your for example your gluteus maximus (your for example your gluteus maximus (your

buttox) is the biggest muscle in your body and buttox) is the biggest muscle in your body and buttox) is the biggest muscle in your body and buttox) is the biggest muscle in your body and your thighs are 30cm in length.your thighs are 30cm in length.your thighs are 30cm in length.your thighs are 30cm in length.

Smooth muscles are different to skeletal Smooth muscles are different to skeletal Smooth muscles are different to skeletal Smooth muscles are different to skeletal muscles,muscles,muscles,muscles, they have a smooth surface athey have a smooth surface athey have a smooth surface athey have a smooth surface and a nd a nd a nd a rererereddish appearance like skeletal muscles.ddish appearance like skeletal muscles.ddish appearance like skeletal muscles.ddish appearance like skeletal muscles.

Parts Parts Parts Parts

There are different parts to different types of There are different parts to different types of There are different parts to different types of There are different parts to different types of muscles. Your skeletal muscle fibres are muscles. Your skeletal muscle fibres are muscles. Your skeletal muscle fibres are muscles. Your skeletal muscle fibres are

bundled together, bundled together, bundled together, bundled together, each fibre is slightly smaller each fibre is slightly smaller each fibre is slightly smaller each fibre is slightly smaller than a hair. Your fibres are madthan a hair. Your fibres are madthan a hair. Your fibres are madthan a hair. Your fibres are made of dozens of e of dozens of e of dozens of e of dozens of smaller parts called fibrils, your fibres are smaller parts called fibrils, your fibres are smaller parts called fibrils, your fibres are smaller parts called fibrils, your fibres are

connected by a connective tissue called connected by a connective tissue called connected by a connective tissue called connected by a connective tissue called epimysiom. epimysiom. epimysiom. epimysiom. They are divided into groups by a They are divided into groups by a They are divided into groups by a They are divided into groups by a

sheath called perimysium. sheath called perimysium. sheath called perimysium. sheath called perimysium.

The size of your muscle depends on how many The size of your muscle depends on how many The size of your muscle depends on how many The size of your muscle depends on how many fibres it hasfibres it hasfibres it hasfibres it has, the bigger the muscle , the bigger the muscle , the bigger the muscle , the bigger the muscle the more the more the more the more fibres it will have. Your fibres are fibres it will have. Your fibres are fibres it will have. Your fibres are fibres it will have. Your fibres are striated at a striated at a striated at a striated at a

microscopic level (This means they look microscopic level (This means they look microscopic level (This means they look microscopic level (This means they look striped).striped).striped).striped).

Tendons connect your muscles to your bones, Tendons connect your muscles to your bones, Tendons connect your muscles to your bones, Tendons connect your muscles to your bones, your bones are at the end of each muscle. They your bones are at the end of each muscle. They your bones are at the end of each muscle. They your bones are at the end of each muscle. They are strengthened by strong thick fibres of are strengthened by strong thick fibres of are strengthened by strong thick fibres of are strengthened by strong thick fibres of collagen. collagen. collagen. collagen. Muscles become thinner or tapers Muscles become thinner or tapers Muscles become thinner or tapers Muscles become thinner or tapers away when they are connected to tendons, theaway when they are connected to tendons, theaway when they are connected to tendons, theaway when they are connected to tendons, these se se se

are stronger than super glue.are stronger than super glue.are stronger than super glue.are stronger than super glue.

Smooth muscles are different to skeletal Smooth muscles are different to skeletal Smooth muscles are different to skeletal Smooth muscles are different to skeletal muscles. There fibres aremuscles. There fibres aremuscles. There fibres aremuscles. There fibres are not striated this not striated this not striated this not striated this

makes them smooth. Smooth muscle fibres are makes them smooth. Smooth muscle fibres are makes them smooth. Smooth muscle fibres are makes them smooth. Smooth muscle fibres are made of groups omade of groups omade of groups omade of groups of smaller cells, these cells f smaller cells, these cells f smaller cells, these cells f smaller cells, these cells

help them move differently.help them move differently.help them move differently.help them move differently.

Smooth muscles Smooth muscles Smooth muscles Smooth muscles don’t have tendons, because don’t have tendons, because don’t have tendons, because don’t have tendons, because they are not connected to bones. Smooth muscles they are not connected to bones. Smooth muscles they are not connected to bones. Smooth muscles they are not connected to bones. Smooth muscles

are the walls of hare the walls of hare the walls of hare the walls of hollow structures in the bodyollow structures in the bodyollow structures in the bodyollow structures in the body thatthatthatthat need to move, like the guts and intestines.need to move, like the guts and intestines.need to move, like the guts and intestines.need to move, like the guts and intestines.

The finaThe finaThe finaThe final type of muscle is the cardiac muscle, l type of muscle is the cardiac muscle, l type of muscle is the cardiac muscle, l type of muscle is the cardiac muscle, this muscle has different parts. It has a special this muscle has different parts. It has a special this muscle has different parts. It has a special this muscle has different parts. It has a special form of striated fibres, these fibres are only form of striated fibres, these fibres are only form of striated fibres, these fibres are only form of striated fibres, these fibres are only found in the heart and adjoining vessels. The found in the heart and adjoining vessels. The found in the heart and adjoining vessels. The found in the heart and adjoining vessels. The fibres are arranged in a spiral shaped fibres are arranged in a spiral shaped fibres are arranged in a spiral shaped fibres are arranged in a spiral shaped pattern, this helps the heart to pattern, this helps the heart to pattern, this helps the heart to pattern, this helps the heart to squeeze blood squeeze blood squeeze blood squeeze blood

around around around around the body.the body.the body.the body.

The heart does not have tendons because it is The heart does not have tendons because it is The heart does not have tendons because it is The heart does not have tendons because it is autautautautomatically working all the time.omatically working all the time.omatically working all the time.omatically working all the time.

MovementMovementMovementMovement

Different muscles move in different ways. Different muscles move in different ways. Different muscles move in different ways. Different muscles move in different ways. Skeletal muscles move with conscious thought , Skeletal muscles move with conscious thought , Skeletal muscles move with conscious thought , Skeletal muscles move with conscious thought , which is controlled by the brain. Consciouswhich is controlled by the brain. Consciouswhich is controlled by the brain. Consciouswhich is controlled by the brain. Conscious thought thought thought thought is when you think about your is when you think about your is when you think about your is when you think about your moving moving moving moving your muscleyour muscleyour muscleyour muscle, this ha, this ha, this ha, this happens by an impulse ppens by an impulse ppens by an impulse ppens by an impulse being being being being sent by the brain to the muscle. When sent by the brain to the muscle. When sent by the brain to the muscle. When sent by the brain to the muscle. When muscles move they contract, your muscles can muscles move they contract, your muscles can muscles move they contract, your muscles can muscles move they contract, your muscles can contract but they can’t get longer. When your contract but they can’t get longer. When your contract but they can’t get longer. When your contract but they can’t get longer. When your muscle fibres contract they shorten muscle fibres contract they shorten muscle fibres contract they shorten muscle fibres contract they shorten to 70% of to 70% of to 70% of to 70% of

their relaxed length.their relaxed length.their relaxed length.their relaxed length.

Skeletal muscles are very adaptable,Skeletal muscles are very adaptable,Skeletal muscles are very adaptable,Skeletal muscles are very adaptable, they can they can they can they can excert small force like picking up a feather or a excert small force like picking up a feather or a excert small force like picking up a feather or a excert small force like picking up a feather or a small obsmall obsmall obsmall object and they can also excert great ject and they can also excert great ject and they can also excert great ject and they can also excert great force, like picking up a heavy object. Skeletal force, like picking up a heavy object. Skeletal force, like picking up a heavy object. Skeletal force, like picking up a heavy object. Skeletal muscles also tire easily, which memuscles also tire easily, which memuscles also tire easily, which memuscles also tire easily, which means they ans they ans they ans they

need a period of rest. These muscles use glucose need a period of rest. These muscles use glucose need a period of rest. These muscles use glucose need a period of rest. These muscles use glucose ((((which is sugarwhich is sugarwhich is sugarwhich is sugar)))) as fuel. Even though skeletal as fuel. Even though skeletal as fuel. Even though skeletal as fuel. Even though skeletal muscles are voluntary, sometimes they react to muscles are voluntary, sometimes they react to muscles are voluntary, sometimes they react to muscles are voluntary, sometimes they react to certain things almost automatically. For certain things almost automatically. For certain things almost automatically. For certain things almost automatically. For

example if you step on something sharp your example if you step on something sharp your example if you step on something sharp your example if you step on something sharp your foot will move autfoot will move autfoot will move autfoot will move automatically.omatically.omatically.omatically.

Next is smooth muscles these muscles move Next is smooth muscles these muscles move Next is smooth muscles these muscles move Next is smooth muscles these muscles move without thought. They are controlled by the without thought. They are controlled by the without thought. They are controlled by the without thought. They are controlled by the automatic nervous system. This is involved in automatic nervous system. This is involved in automatic nervous system. This is involved in automatic nervous system. This is involved in

the regulation of your bodies internal the regulation of your bodies internal the regulation of your bodies internal the regulation of your bodies internal environment. Smooth muscles contract in a environment. Smooth muscles contract in a environment. Smooth muscles contract in a environment. Smooth muscles contract in a gradual synchronised manner, tgradual synchronised manner, tgradual synchronised manner, tgradual synchronised manner, they are much hey are much hey are much hey are much slower than skeletal muscles. These muscles slower than skeletal muscles. These muscles slower than skeletal muscles. These muscles slower than skeletal muscles. These muscles regulate the size of the lumen in blood vessels. regulate the size of the lumen in blood vessels. regulate the size of the lumen in blood vessels. regulate the size of the lumen in blood vessels. Smooth muscles have a wave like motion like Smooth muscles have a wave like motion like Smooth muscles have a wave like motion like Smooth muscles have a wave like motion like the guts and the intestines. the guts and the intestines. the guts and the intestines. the guts and the intestines. These muscles don’t These muscles don’t These muscles don’t These muscles don’t tire,tire,tire,tire, they keep contracted for a steady and long they keep contracted for a steady and long they keep contracted for a steady and long they keep contracted for a steady and long time, thtime, thtime, thtime, they work aley work aley work aley work all the time, involuntary l the time, involuntary l the time, involuntary l the time, involuntary

muscles help the movement of many things like muscles help the movement of many things like muscles help the movement of many things like muscles help the movement of many things like the andlens in yourthe andlens in yourthe andlens in yourthe andlens in your eye, teye, teye, teye, they hey hey hey help help help help digestion digestion digestion digestion and the skinand the skinand the skinand the skin(when reacting(when reacting(when reacting(when reacting to certain to certain to certain to certain

feelings).feelings).feelings).feelings). These muscles also respond to stress, These muscles also respond to stress, These muscles also respond to stress, These muscles also respond to stress, they change the bodies function for diffethey change the bodies function for diffethey change the bodies function for diffethey change the bodies function for different rent rent rent situations like becoming nervous and excited.situations like becoming nervous and excited.situations like becoming nervous and excited.situations like becoming nervous and excited.

The last type of muscle is the cardiac muscle. The last type of muscle is the cardiac muscle. The last type of muscle is the cardiac muscle. The last type of muscle is the cardiac muscle. This muscle moves without thought, even This muscle moves without thought, even This muscle moves without thought, even This muscle moves without thought, even

though it is striated like skeletal muscles, it is a though it is striated like skeletal muscles, it is a though it is striated like skeletal muscles, it is a though it is striated like skeletal muscles, it is a tireless tireless tireless tireless type of muscle and it works type of muscle and it works type of muscle and it works type of muscle and it works

automatically all the time.automatically all the time.automatically all the time.automatically all the time. It speeds up and It speeds up and It speeds up and It speeds up and slows down when it is needed. This muscle slows down when it is needed. This muscle slows down when it is needed. This muscle slows down when it is needed. This muscle contracts like a wave to push blood around the contracts like a wave to push blood around the contracts like a wave to push blood around the contracts like a wave to push blood around the

body. It has the ability to contract body. It has the ability to contract body. It has the ability to contract body. It has the ability to contract spontaneously and will beat for a long time spontaneously and will beat for a long time spontaneously and will beat for a long time spontaneously and will beat for a long time

after it is removeafter it is removeafter it is removeafter it is removed from the body.d from the body.d from the body.d from the body.

ExerciseExerciseExerciseExercise While you exercise youWhile you exercise youWhile you exercise youWhile you exercise your muscles will move r muscles will move r muscles will move r muscles will move

quicker.quicker.quicker.quicker. You will consciously think about them You will consciously think about them You will consciously think about them You will consciously think about them to move, they need more glucose as they are to move, they need more glucose as they are to move, they need more glucose as they are to move, they need more glucose as they are using more energy . When your muscles over using more energy . When your muscles over using more energy . When your muscles over using more energy . When your muscles over

tire, they can get cramped.tire, they can get cramped.tire, they can get cramped.tire, they can get cramped.

When you damage your muscle fibres you will When you damage your muscle fibres you will When you damage your muscle fibres you will When you damage your muscle fibres you will build muscles. This happens build muscles. This happens build muscles. This happens build muscles. This happens by your muscle by your muscle by your muscle by your muscle fibres tearing, then when they heal they will fibres tearing, then when they heal they will fibres tearing, then when they heal they will fibres tearing, then when they heal they will

become thicker and stronger.become thicker and stronger.become thicker and stronger.become thicker and stronger.

When you exercise other systems accelerate by When you exercise other systems accelerate by When you exercise other systems accelerate by When you exercise other systems accelerate by using energy and oxygen quicker. Your heart using energy and oxygen quicker. Your heart using energy and oxygen quicker. Your heart using energy and oxygen quicker. Your heart will beat faster, blood vessels transport more will beat faster, blood vessels transport more will beat faster, blood vessels transport more will beat faster, blood vessels transport more blood and you will also brblood and you will also brblood and you will also brblood and you will also breathe quicker.eathe quicker.eathe quicker.eathe quicker.

Whilst we exercise these are our three main Whilst we exercise these are our three main Whilst we exercise these are our three main Whilst we exercise these are our three main systems that are used, but there are other systems that are used, but there are other systems that are used, but there are other systems that are used, but there are other system too, like the skeletal system , urinary system too, like the skeletal system , urinary system too, like the skeletal system , urinary system too, like the skeletal system , urinary system asystem asystem asystem and many other vital systems, that are nd many other vital systems, that are nd many other vital systems, that are nd many other vital systems, that are

important while we exerciseimportant while we exerciseimportant while we exerciseimportant while we exercise....

CiCiCiCirculatorrculatorrculatorrculatory System y System y System y System

Muscular Muscular Muscular Muscular SystemSystemSystemSystem

Respiratory System Respiratory System Respiratory System Respiratory System By Russel A By Russel A By Russel A By Russel A ☺☺☺☺