Question

double sirculation in heart​

Answer 1

Answer:

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

Explanation:

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Answer 2

Answer:

First Deoxygenated blood from heart to lungs. Then oxygenated blood from lungs to heart and to the whole body.

First: From heart to lungs

Second: From heart to whole body.

By this double circulation of heart is present in humans