a

Human Circulatory System

you can feel your heart fighting away

every time you put your hand to your

chest but do you have any idea what's

really going on in there or what keeps

your heart ticking as it should every

day your heart beats about 100,000 times

sending 2,000 gallons of blood surging

through your body although it's no

bigger than your fist your heart has the

mighty job of keeping the blood flowing

through 60,000 miles of blood vessels

that feed your organs and tissues food

water and oxygen are essential for the

existence of human life blood transports

all these substances through various

channels called blood vessels blood

vessels involves arteries veins

capillaries to keep the blood flowing

throughout our body we have a pumping

system and the heart is the pump which

is composed of muscle that pumps blood

throughout the body

beating approximately 72 times per

minute of our lives the human heart has

four chambers the right atrium

the left atrium

the right ventricle

and the left ventricle

there are four valves in the heart these

valves are tricuspid valve

mitral valve

a or take valve

pulmonic valve

these valves are one-way valves

now you have seen the structure of the

heart let us find out how it works

the blood becomes oxygen-rich by

absorbing oxygen in the lungs the

function of the heart starts when

oxygenated blood is carried from the

lungs to the left atrium of the heart by

means of the pulmonary veins the left

atrium relaxes this blood is pumped into

the heart

when the left atrium contracts the left

ventricle relaxes simultaneously the

left atrium pushes the blood into the

left ventricle through the one-way valve

when the left ventricle

tracks the blood is pumped into the

aorta which carries oxygenated blood to

the different parts of the body except

the lungs oxygenated blood reaches the

different parts of the body through the

blood vessels called the arteries the

arteries gets branched into capillaries

which then reaches to the different

organs of the body the blood and becomes

deoxygenated and the blood capillaries

gets mixed and form thicker blood

vessels called the veins the veins carry

deoxygenated blood to the heart the

blood vessels that carry deoxygenated

blood heart are known as the vena cava

the deoxygenated blood from different

parts of body enters the upper right

chamber of the heart which is called the

right atrium

tracted allowing the blood to flow into

the right ventricle which contracts with

the expansion of the right atrium

through the one-way valve the right

ventricle then contracts pushing the

blood into the pulmonary artery the

pulmonary artery carries the

deoxygenated blood to the lungs for

oxygenation the lungs oxygenate the

blood by exchanging of gases and flows

back into the heart through the

pulmonary vein and starts the

circulatory cycle all over again