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What is the function of the human heart and how does it circulate blood?
Updated: 11-Apr-2025

The heart is a muscular organ that pumps blood throughout the body. It has four chambers: two atria and two ventricles. Oxygen-poor blood enters the right side, gets pumped to the lungs for oxygen, then returns to the left side and is pumped to the rest of the body.

This continuous cycle delivers oxygen and nutrients to tissues while removing waste like carbon dioxide. The heartbeat is controlled by electrical signals from the heart’s pacemaker

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