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CBSE Class 10 Answered

WHAT is double circulation ? How does a heart works?
Asked by dharmendralaskar | 28 Dec, 2018, 05:37: PM
answered-by-expert Expert Answer

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.

Double circulation in human beings:

The heart receives deoxygenated blood from different parts of the body, and it pumps this blood to the lungs. The oxygenated blood from the lungs returns to the heart, which is pumped again into different parts of the body by the heart. Thus, the blood passes twice through the heart making one complete round through the body. This is called double circulation.

Pulmonary and systemic circulation

The pulmonary circulation pertains to lungs. The blood flows from the right ventricle to the lungs. Pulmonary veins collect oxygenated blood from the lungs and carry it back to the heart (left auricle). 

The systemic circulation pertains to the major circulation of the body. The aorta receives the blood from the left ventricle and sends it to the various parts of the body. Veins collect the deoxygenated blood from the body parts and pour it back into the right auricle. 

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