Question

why is blood circulation in human heart called double circulation?

Answer 1

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The blood circulation in human heart is called double circulationbecause the blood passes through the heart twice in one complete cycle of the body – once through the right half in the form of deoxygenated blood and once through the left half in the form of oxygenated blood.
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Answer 2

The blood circulation in human heart is called double circulation bcz blood passes through heart twice.