Question

describe double circulation in human being. 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.

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Answer 2

Answer:

double circulation is when the blood passes through the heart twice

It is necessary to separate oxygenated and deoxygenated blood in mammals and birds because it allows a highly efficient supply of oxygen to the body this is useful as mammals and birds that have high energy needs