Question

Why is double circulation of blood is necessary in humanbeings ?

Answer 1

Double circulation helps to keep oxygenated and deoxygenated blood from mixing. Such separation allows a highly efficient supply of oxygen to the body. This is useful in animals that have high energy needs, such as humans (as well as birds and other mammals), which constantly use energy to maintain their body temperature.

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Answer 2

Heart - the pumping organ is responsible for double circulation.
In double circulation, once oxygenated blood enters in body organs from left ventricle and then deoxygynated blood enters right ventricle from body organs. Since blood enters heart twice , therefore it is called double circulation.
It is necessary to pump and regulate the blood in all bofy organs.

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