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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


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