Which of the Following is Often Called the Pacemaker of the Heart

Question

Which of the following is often called the pacemaker of the heart?
A) Purkinje fibers
B) sinoatrial (SA) node
C) atrioventricular (AV) bundle (bundle of His)
D) atrioventricular (AV) node

Accepted Answer

The sinoatrial (SA) node, located in the right atrium of the heart, is often called the pacemaker of the heart because it initiates the electrical impulses that stimulate the contraction of the heart muscle.