What component of the conduction system is referred to as the pacemaker of the heart?

A) Bundle of His
B) Bundle branches
C) Sinoatrial (SA) node
D) Atrioventricular (AV) node

Sinoatrial Node

A small group of cells in the right atrium of the heart that acts as the natural pacemaker by initiating the heartbeat.

Atrioventricular Node

A part of the electrical conduction system of the heart that coordinates the top of the heart. It plays a critical role in regulating the timing of heart contractions.

Bundle of His

A collection of heart muscle cells specialized for electrical conduction that transmits impulses from the AV node to the ventricles of the heart.