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The Heart
The heart is a muscular organ about the size of a fist, located slightly left of the chest's center. It pumps blood through the circulatory system, supplying oxygen and nutrients to the body while removing waste products. The heart consists of four chambers: two atria (upper chambers) and two ventricles (lower chambers). The heart works through a rhythmic contraction and relaxation cycle, known as the heartbeat. It plays a critical role in maintaining blood circulation, which is essential for life.
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