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14 Nov 2021

Background and context

The cardiac cycle consists of four phases with two periods in diastole and two periods in systole of the heart muscle. The first period is the period of ventricular filling, which occurs during diastole. The second period is the isovolumetric contraction period, which occurs at some stage in systole. The 1/3 period is the ventricular period, which occurs during systole, and the fourth period is the isovolumetric relaxation, which occurs during diastole.

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