Each Heartbeat is Initiated by the _______, or Pacemaker

Question

Each heartbeat is initiated by the _______, or pacemaker.
A) Purkinje fibers
B) mitral valve
C) atrioventricular bundle
D) SA node

Accepted Answer

Each heartbeat is initiated by the SA node, also known as the pacemaker of the heart. The SA node is located in the right atrium and is responsible for generating the electrical impulses that trigger the contraction of the heart muscles. The Purkinje fibers, atrioventricular bundle, and mitral valve are all important components of the heart's electrical conduction system but are not responsible for initiating the heartbeat.