circulatory system part 3: blood vessels - function - structure -location
TRANSCRIPT
Circulatory SystemCirculatory System
Part 3: Blood VesselsPart 3: Blood Vessels-function function -structurestructure-location-location
Types of Blood VesselsTypes of Blood Vessels
1.1. ArteriesArteries
2.2. VeinsVeins
3.3. CapillariesCapillaries
1. Arteries- function1. Arteries- function
Carry blood AWAY from the heartCarry blood AWAY from the heart Deliver oxygenated blood to body (systemic)Deliver oxygenated blood to body (systemic) Deliver deoxygenated blood to the lungs Deliver deoxygenated blood to the lungs
(pulmonary)(pulmonary)
1. Arteries- structure1. Arteries- structure
Thick walledThick walled ElasticElastic
Artery walls can expand due to the increased pressure Artery walls can expand due to the increased pressure from pumped bloodfrom pumped blood
Walls rebound after each contraction (pulse)Walls rebound after each contraction (pulse)
1. Arteries- location1. Arteries- location
Deeper in tissue along bonesDeeper in tissue along bones More protected from injury/ temp lossMore protected from injury/ temp loss Pressurized vessels- high blood loss if severedPressurized vessels- high blood loss if severed
2. Veins- function2. Veins- function
Carry blood BACK TO the heartCarry blood BACK TO the heart Transport deoxygenated from body tissue Transport deoxygenated from body tissue
(systemic)(systemic) Transport oxygenated from lungs(pulmonaryTransport oxygenated from lungs(pulmonary
2. Veins- structure2. Veins- structure
Thin walledThin walled Don’t receive large amounts of blood so no Don’t receive large amounts of blood so no
need for elastic walls (low pressure)need for elastic walls (low pressure) Contain valves- prevents back flowContain valves- prevents back flow Blood movement do to muscle activity in the Blood movement do to muscle activity in the
bodybody
2. Veins- location2. Veins- location
Closer to surfaceCloser to surface Often surrounded with skeletal muscleOften surrounded with skeletal muscle Lower pressure= less blood loss if severedLower pressure= less blood loss if severed
Arterioles and VenulesArterioles and Venules
Small arteries and veinsSmall arteries and veins Same features but smaller scaleSame features but smaller scale Arterioles have sphincter muscles which can Arterioles have sphincter muscles which can
dilate/ contract to regulate BP/ flowdilate/ contract to regulate BP/ flow Blood temp is regulated this wayBlood temp is regulated this way blood flow to surface= temp lossblood flow to surface= temp loss To prevent temp loss (when it is cold) blood is To prevent temp loss (when it is cold) blood is
prevented from going (white lips/ fingertips)prevented from going (white lips/ fingertips)
3. Capillaries- function3. Capillaries- function
Connects arteries to veinsConnects arteries to veins Delivery of water, oxygen, and nutrients to Delivery of water, oxygen, and nutrients to
tissuetissue Pick up water and waste from extracellular Pick up water and waste from extracellular
fluidfluid
3. Capillaries- structure3. Capillaries- structure
Very thin wallsVery thin walls Single layer of cellsSingle layer of cells
3. Capillaries- location3. Capillaries- location
Everywhere Everywhere Within a few cells of each otherWithin a few cells of each other Needs to provide nutrient and gas exchange to Needs to provide nutrient and gas exchange to
all cellsall cells
Major Blood VesselsMajor Blood Vessels1.1. AortaAorta
Major blood vessel Major blood vessel carrying blood out of heartcarrying blood out of heart
Leaves left ventricle and Leaves left ventricle and loops over top of heart- loops over top of heart- Aortic Arch Aortic Arch
Descends along inside of Descends along inside of backbone as dorsal aortabackbone as dorsal aorta
Branches off to feed all Branches off to feed all the body systems (except the body systems (except lungs)lungs)
Major Blood VesselsMajor Blood Vessels2. Coronary Arteries/ Veins2. Coronary Arteries/ Veins
First branches off aortaFirst branches off aorta Surface of heartSurface of heart Artery provides heart with Artery provides heart with
nutrientsnutrients Vein takes deoxygenated to Vein takes deoxygenated to
vena cavavena cava
Major Blood VesselsMajor Blood Vessels
3. Carotid Arteries3. Carotid Arteries Take blood to headTake blood to head Specialized with nerve endingSpecialized with nerve ending
Chemoreceptors (O2 levels)Chemoreceptors (O2 levels) Pressure receptors (BP)Pressure receptors (BP)
Major Blood VesselsMajor Blood Vessels4. Jugular Veins4. Jugular Veins
Match carotid arteryMatch carotid artery Bring blood from head to anterior vena cavaBring blood from head to anterior vena cava No valves (gravity)No valves (gravity)
Major Blood VesselsMajor Blood Vessels
5. Subclavian arteries/ veins5. Subclavian arteries/ veins Arteries originate from aortaArteries originate from aorta Pass under the clavicle and branch to feed arms Pass under the clavicle and branch to feed arms
(brachial artery) and chest(brachial artery) and chest
Major Blood VesselsMajor Blood Vessels
6. Mesenteric artery/ vein6. Mesenteric artery/ vein Artery branches off dorsal aortaArtery branches off dorsal aorta Subdivides and goes into intestinesSubdivides and goes into intestines
7. Hepatic Portal Vein7. Hepatic Portal Vein Transports nutrients from intestine to liverTransports nutrients from intestine to liver
8. Hepatic Vein8. Hepatic Vein Blood leaving liver goes to inferior vena Blood leaving liver goes to inferior vena
cavacava
Major Blood VesselsMajor Blood Vessels9. Renal Arteries/ Veins9. Renal Arteries/ Veins
Artery branches off of dorsal aorta through lower back Artery branches off of dorsal aorta through lower back to kidneysto kidneys
Vein takes blood from kidneys to posterior vena cavaVein takes blood from kidneys to posterior vena cava
Major Blood VesselsMajor Blood Vessels
10. Iliac Arteries/ veins10. Iliac Arteries/ veins Dorsal aorta divides at pelvic region into 2 iliac Dorsal aorta divides at pelvic region into 2 iliac
arteries, one going down each legarteries, one going down each leg Femoral artery (quadriceps) is a major branch of each Femoral artery (quadriceps) is a major branch of each
iliac arteryiliac artery
Major Blood VesselsMajor Blood Vessels
11. Superior / Inferior vena cava11. Superior / Inferior vena cava Collect all blood from veins of systemic circuit and Collect all blood from veins of systemic circuit and
conducts back to right atriumconducts back to right atrium
Major Blood VesselsMajor Blood Vessels
12. Pulmonary Arteries/ Veins12. Pulmonary Arteries/ Veins Composes the pulmonary circuitComposes the pulmonary circuit Artery takes deoxygenated blood to lungsArtery takes deoxygenated blood to lungs Vein takes oxygenated blood to the left atriumVein takes oxygenated blood to the left atrium