write about cardiac cycle....?
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The cardiac cycle is the performance of the human heart from the ending of one heartbeat to the beginning of the next. It consists of two periods: one during which the heart muscle relaxes and refills with blood, called diastole, followed by a period of robust contraction and pumping of blood, dubbed systole.
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Explanation:
Cardiac cycle is the period between the ending of one heart beat to the starting of the next one. First the cardiac muscles expand to generate pressure and the relax to pump the blood.
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