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Anatomy of the Heart

Systole Phase

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

Cardiac Cycle Systole Phase

Contraction passes from AV node to
Purkinje fibers and ventricular cells.

Ventricles contract.

Atrioventricular valves close.

Semilunar valves open.

Blood is pumped from the ventricles
to the arteries.

Cardiac Cycle

Cardiac Conduction

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