Question

How does human circulatory system works

Answer 1

Answer:

Explanation:

The blood circulatory system (cardiovascular system) delivers nutrients and oxygen to all cells in the body. It consists of the heart and the blood vessels running through the entire body. The arteries carry blood away from the heart; the veins carry it back to the heart.

Answer 2

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Answer:

The blood circulatory system (cardiovascular system) delivers nutrients and oxygen to all cells in the body. ... Blood circulation starts when the heart relaxes between two heartbeats: The blood flows from both atria (the upper two chambers of the heart) into the ventricles (the lower two chambers), which then expand.

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