Question

Why is double circulation of blood necessary in human beings?

Answer 1

as you know that human beings are mammals.


mammals are warm blooded animal


so for maintaining the its body temperature it requires continuous supply of oxygen.

so there is requirement of double circulatory system...

Answer 2

During a single cycle blood goes twice in the heart known as single circulation. It is necessary to separate oxygenated and deoxygenated blood because this makes circulatory system efficient and helps in maintaining constant body temperature.