Fig

The heart's beat is caused by an electrical impulse that travels from the S-A, or sinoa-trial, node to the A-V, or atrioventricular, node and through the specialized heart muscle.

Systole:

Means the heart is contracting. It usually means the ventricles are contracting, but it can also refer to atrial contraction.

Diastole:

The portion of the cardiac cycle in which the heart is relaxed.

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