Which Structure is Known as the "Pacemaker" of the Heart

Question

Which structure is known as the "pacemaker" of the heart?
A) Purkinje fibers
B) sinoatrial node
C) atrioventricular node
D) bundle of His

Accepted Answer

The sinoatrial node, located in the wall of the right atrium, is known as the "pacemaker" of the heart because it initiates the electrical impulse that triggers each heartbeat. The other structures listed play important roles in the conduction of electrical impulses through the heart, but do not initiate them.