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WORK OF THE HUMAN HEART. The human heart contract from the first moment of life until the last. Reduction of the heart pumps blood through the arteries to all parts of the body. Physiology found that adult heartbeat ranges from 60 to 72 beats per minute. Children have a much higher rate of heartbeats. Research has found that the rate of heart rhythm increases depending on different emotions. Each heart beat is accompanied by a rest period. Each contraction and relaxation period of cardiac cycle. Each cardiac cycle consists of three phases: the first phase short cuts atrial systole, the second phase of a longer-term reduction in ventricular Systole. The rest period is called diastole. Research many physiologists evaluated the role of the ventricles as the main pump of the human heart.
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