The role of the atrioventricular node (AV node) is to:
a. initiate a sinus rhythm.
b. initiate ventricular depolarization.
c. slow down impulses so that the atria can contract to fill the adjacent ventricles with blood.
d. conduct impulses to the sinoatrial node (SA node).
Answer: c. slow down impulses so that the atria can contract to fill the adjacent ventricles with blood.
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