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10/09/2021 11:48 am
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Describe double circulation in human beings. Why is it necessary?
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10/09/2021 11:49 am
Double circulation means that the blood flows twice through the heart to complete one circuit in the body.
It has two parts:
- The pulmonary circulation in which deoxygenated blood flows from the heart to the lungs, where it gets oxygenated, and again comes back to the heart via pulmonary vein.
- The systemic circulation in which the oxygenated blood flows from the heart to all the organs of the body except lungs, and then back again to the heart via vena cava.
Double circulation is necessary to prevent intermixing of deoxygenated and oxygenated blood. It is also required to provide a highly efficient supply of oxygen to the body.