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The cardiac cycle consists of one complete heartbeat divided into systole and diastole. It is initiated by the sinoatrial node and involves pressure and volume changes in the heart chambers, opening and closing of valves, and changes in the electrocardiogram. The cycle has eight phases over 0.8 seconds and involves isovolumetric contraction, maximal ejection, reduced ejection during ventricular systole, and isovolumetric relaxation, rapid inflow, slow inflow, and atrial systole during ventricular diastole.

Author
Mudassar Roomi
Language
EN

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