Question

Describe double circulation in human beings. Why is it necessary?

Answer 1

DOUBLE CIRCULATION IS NECESSARY FOR MAMALS TO GENERATE LARGE AMOUNT OF ENNERGY

Answer 2

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.