I want a brief answer on the question Describe double-circulation in human beings.Why is it necessary?

Asked by  | 10th Sep, 2012, 07:53: AM

Expert Answer:

Here the blood flows twice through the heart during one cycle of passage through the body.

It occurs as : Right ventricle -->  Lungs --> Left atrium --> Left ventricle --> Various body parts --> Right atrium

Double circulation helps to keep oxygenated and deoxygenated blood from mixing. Such separation allows a highly efficient supply of oxygen to the body since blood flows at higher pressure. This increases the rate of supply of food and oxygen to the cell and also rapid removal of wastes from them. Such a circulation 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.

Answered by  | 10th Sep, 2012, 09:31: AM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.