Question

why blood circulation is in human heart is called double circulation system ​

Answer 1

Answer:

Blood passes through the heart twice per circuit. The right pump sends deoxygenated blood to the lungs where it becomes oxygenated and returns back to the heart. The left pump sends the newly oxygenated blood around the body.

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Answer 2

Answer:

Because 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.