Describe the structure and functions of the human heart. Explain the roles of its four chambers, valves, major blood vessels, and septum in maintaining proper circulation.

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The human heart is a muscular organ with four chambers: two atria and two ventricles. Valves prevent the backward flow of blood. The right side receives deoxygenated blood and sends it to the lungs, while the left side pumps oxygenated blood to the body.

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