Question

describe double circulation in human beings why is it necessary

Answer 1

Human heart shows double circulation. it is a circualtion in which blood passes twice throught the heart during one complete cardiac cycle to supply once to the body. ..

Double circulation or complete separation of oxygenated and deoxygenated blood allows efficient supply of oxygen to the body which is useful in birds and mammals that have high energy needs to maintain a constant body temperature throughout the year. ........✌✌✌✌

HOPE IT WILL HELP YOU. ...........

Answer 2

in double circulation there are two are four chambers are present which are are known as right and left arota and ventricle in which first of all deoxygenated and then oxygenated blood get enter into heart  through vesciles and it is important because of this pure and impure blood are seperated whether it is not seperated  that is is very harmful for us.