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The heart is a muscular organ that pumps blood throughout the body, supplying oxygen and nutrients to tissues and organs. It is approximately the size of a fist and sits in the chest, between the lungs. The heart has four chambers: the left and right atria (upper chambers) and the left and right ventricles (lower chambers). It is responsible for both systemic circulation, which delivers oxygenated blood to the body, and pulmonary circulation, which moves deoxygenated blood to the lungs. The heart is essential for maintaining life, and regular exercise and a healthy lifestyle are crucial for keeping it in good condition.
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