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The Cardiac Cycle
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Atrial Diastole
Atria are in relaxation mode, and blood accumulates from the veins.
Ventricular Filling
Ventricles fill with blood passively followed by active atrial contraction.
Atrial Systole
Atria contract pushing blood into the ventricles.
Ventricular Ejection
Ventricles contract fully, ejecting blood into aorta and pulmonary artery.
Isovolumetric Relaxation
Ventricles relax with both sets of valves closed, initiating diastole.
Isovolumetric Contraction
Ventricles begin to contract with both sets of valves closed.
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