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The Cardiac Cycle

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Atrial Systole

Atria contract pushing blood into the ventricles.

Isovolumetric Contraction

Ventricles begin to contract with both sets of valves closed.

Ventricular Ejection

Ventricles contract fully, ejecting blood into aorta and pulmonary artery.

Isovolumetric Relaxation

Ventricles relax with both sets of valves closed, initiating diastole.

Ventricular Filling

Ventricles fill with blood passively followed by active atrial contraction.

Atrial Diastole

Atria are in relaxation mode, and blood accumulates from the veins.

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