The "Pacemaker" for the Heart is Usually The

Question

The "pacemaker" for the heart is usually the
A) sinoatrial node
B) Purkinje fibers
C) bundle of His
D) atrioventricular bundle

Accepted Answer

The sinoatrial node, located in the right atrium of the heart, is commonly referred to as the "pacemaker" of the heart as it initiates the electrical impulses that regulate the heartbeat. The other options - Purkinje fibers, bundle of His, and atrioventricular bundle - all play important roles in the conduction of the electrical impulses throughout the heart, but they are not the primary pacemaker.