Facts about Cardiac Cycle Phases

1. 05

   Isovolumetric relaxation follows aortic valve closure, during which ventricular pressure drops rapidly while all heart valves remain closed and volume stays constant.

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2. 04

   Atrial systole, the final phase of diastole, contributes approximately 20–30% of ventricular filling, often called the atrial kick.

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3. 03

   The brief isovolumetric contraction phase occurs when the ventricles contract but all valves remain closed, causing pressure to rise without any change in blood volume.

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4. 02

   Systole, the contraction phase of the cardiac cycle, drives oxygenated blood from the left ventricle into the aorta and deoxygenated blood from the right ventricle into the pulmonary artery.

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5. 01

   During the cardiac cycle phases, diastole is the period when the heart muscle relaxes and the ventricles fill with blood.

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