HOW BLOOD CIRCULATES IN OUR BODY

The blood circulation


The blood circulation

The heart has four chambers called right atrium, left atrium, right atrium and left ventricle. In the heart there are four valves called pulmonic valve, aortic valve, mitral valve, tricuspid valve. The functions starts when blood is carried from the lungs to the left atrium by means of the pulmonary vein the left atrium relaxes this blood is pumped to 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 contracts the blood is pumped to the aorta, which carries oxygenated blood in different parts of the body except the lungs, The oxygenated blood reaches tp the different parts of the body through the vessels called arteries, the arteries get branch into the capillaries, which then reaches to the different organs in the body, the blood then become deoxygenated, the blood capillaries then it is mixed and form thicker blood vessels called veins, the veins carry deoxygenated blood to the heart, the blood vessels which carry the blood into the heart are called venacava, the deoxygenated blood from the different parts of the body then reaches to the right atrium, the the right atrium then gets contracted allowing the blood to flow to 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 lungs for oxygenation, the lungs oxygenate the blood by exchange of gases and flows back into the heart through the pulmonary vein and starts thr circuitry cycle all over again. 

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