Question

why is blood circulation in human heart called double circulation​

Answer 1

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Human heart is four chambered and there is complete separation of oxygenated and deoxygenated blood. So the blood passes twice through heart to supply once to the body. It occurs once in left half of heart and once through the right half of heart.

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Answer 2

Answer:

●Because the blood circulation in humans involves two different pathways or cycles of blood circulation, making it a double circulation. They are: ... During this cycle, the oxygenated blood is forced out of the heart into the body parts, and the deoxygenated blood from the body parts is carried back to the heart.