Question

describe double circulation in human beings why is it necessary

Answer 1

During a single cycle blood goes twice in the heart which is known as double circulation . It is necessary in human being to separate oxygenated and de - oxygenated blood because this makes their circulatory system is more efficient and helps in maintaining constant body temperature.

Answer 2

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The blood passes through the heart twice through separate pathways for completing one cycle. This type of circulation is called double circulation. The double circulation includes - Systemic and Pulmonary circulation.

$\bold{Systematic\: circulation:-}$ In systematic circulation, the oxygenated blood from the aorta is distributed to various body parts. The deoxygenated blood is again collected from the different organs of the body by the veins to pour into the superior and inferior vena cava. Both the vena canvas then allow the passage of this deoxygenated blood into the right atrium and this blood again goes into the right ventricle from where again Pulmonary circulation starts.

$\bold {Pulmonary \:circulation :-}$ The deoxygenated blood from the parts of the body is pushed by the right ventricle into the lungs for Oxygenation through the Pulmonary vein. Through left atrium, it enters the left ventricle and then into the aorta for systemic circulation.

$\bold{Necessity :-}$ Double circulation helps to accept blood oxygen from the alveoli of the lungs and the same oxygen is distributed to the body cells.

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