What is the Pacemaker of the Heart

Question

What is the pacemaker of the heart?
A) AV node
B) bundle of His
C) Purkinje fibers
D) SA node

Accepted Answer

The SA node, or sinoatrial node, is known as the pacemaker of the heart because it initiates the electrical impulses that cause the contraction of the heart muscle. It is located in the walls of the right atrium and is responsible for setting the rhythm and rate of the heartbeat.