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In order to allow the ventricles with enough time to properly fill and to allow the atria to empty.
A. The atrioventricular (AV) node delays the electrical impulse that originated from the sinoatrial (SA) node
B. The myocardium is composed of type I muscle fibers to contract slowly to allow the ventricles to fill.
C. The Purkinje fibers contract slowly
D. The atrioventricular (AV) bundle slows the electrical impulse that originated from the AV node