Which part of the cardiac conduction system is known as the pacemaker of the heart?

A) SA node
B) AV node
C) Bundle of His
D) Purkinje fibers
E) Bundle branches

SA Node

Sinoatrial Node, the natural pacemaker of the heart located in the right atrium, responsible for initiating the heart's electrical impulses.

Pacemaker

An electronic device implanted in the body to regulate the heartbeat, used primarily in conditions where the heart's rhythm is abnormally slow.

Cardiac Conduction

The system of electrical signals that initiate and regulate the heart's rhythm and beat.