Question

describe the double circulation in human beings. Why is it necessary?
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Answer 1

Answer:

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

Answer:

double circulation is a biological process in which oxygen reaches the heart and and the whole body in a time.

it is necessary to keep our heart pumping