Diastole

Biology

Anatomy of the Heart

Diastole Phase

The cardiac cycle is the sequence of events that occur when the heart beats. There are two phases of this cycle:

Cardiac Cycle Diastole Phase

Early Diastole	Ventricles relax. Semilunar valves close. Atrioventricular valves open. Ventricles fill with blood.
Mid Diastole	Atria and Ventricles are relaxed. Semilunar valves are closed. Atrioventricular valves are open. Ventricles continue to fill with blood.
Late Diastole	SA node contracts. Atria contract. Ventricles fill with more blood. Contraction reaches AV node.

Cardiac Cycle

Cardiac Conduction

Back to Anatomy of the Heart

Regina Bailey
Biology Guide

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