The pacemaker function in the mammalian heart is performed by the
A) sinoatrial node.
B) atrioventricular node.
C) Purkinje fibers.
D) bundle of His.
E) ventricular mass.

Question

Quizplus · Accepted Answer

The sinoatrial node, located in the right atrium, is considered the natural pacemaker of the heart as it generates electrical impulses that regulate the heartbeat. The other structures listed (atrioventricular node, Purkinje fibers, bundle of His, and ventricular mass) also play important roles in the conduction of electrical impulses in the heart, but they are not the primary site of pacemaker activity.

The Pacemaker Function in the Mammalian Heart Is Performed by the