Structure of heart

HEARTThe heart is a four-

chambered muscular organs that pumps blood to all part of the body. It is able to do so by the

rhythmic contraction and relaxation of its muscles. These are known as the heart beats . A normal

heart beats about 60 to 80 times a minute . We can hear our heart beat

with the help of an instrument called

stethoscope.

REAL HEART.

THE FOUR CHAMBERS OF HEART ARE

The right auricle

The left auricleThe right

ventricleThe left

ventricle

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The right auricle opens into the right ventricle and

the left auricle in to

the left ventricle

Right chambers Left chambers

Right auricle

Left auricle

Right ventricle Left ventricle

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As your heart beats and forces blood through your body , you would fell a throbbing sensation at any point where an artery comes close to the surface of your skin , such as wrist ,neck , or upper arm. This throbbing sensation is called the pulse.

PULSE

Counting your pulse rate is

simple way to estimate how fast

your heart is beating .the pulse is often measured

by a doctor as part of physical

examination ,or an emergency, but you can easily

learn to measure your pulse a s

well.

When you exercise , have a fever , or are under

stress , your heart rate usually speeds up to

meet your body’s increased need for

oxygen and nutrients carried in the blood .the

pulse is usually measured after you have rested or

sat quietly for 10 minutes . This measurement is

called resting pulse . The usually resting pulse for

an adult is 50 to 100 beats per minute.

RESTING PULSE.

The walls of the auricles are thinner than those of the ventricles because the auricles have to pump blood into the ventricles ,which is very near. The walls of the ventricles are thicker ,since they have to push the blood to reach the farthest parts of the body .The blood in the right side of the heart remains completely separated from the left side with the help of valves.

Valves separate each of the

chambers which allow blood to flow

only into one direction. Thus ,

there is no mixing of oxygenated

(oxygen-rich) and deoxygenated

(carbon dioxide- rich )blood.

The veins get deoxygenated

blood to the right auricle from all

parts of the body. This blood is

pumped into the right ventricle, which in turns

pumps it into the pulmonary artery

that takes it to the lungs for

oxygenation.

In the lungs carbon dioxide diffuses out into the alveoli and oxygen diffuses in .

The oxygen-rich blood is carried from the

lungs to the heart by the pulmonary vein .

Oxygenated blood enters the left auricle . It is then pumped into

the left ventricle .The left ventricle then pumps the oxygenated

blood to all parts of the body.

THANK YOU.

DONE BY,SUKANYA.P.S

UKESAN7:K