A 50-year-old female received trauma to the chest that caused severe impairment of the primary pacemaker cells of the heart. Which of the following areas received the greatest damage?
A) AV node
B) SA node
C) Bundle of His
D) Ventricles

Question

Quizplus · Accepted Answer

The SA node (sinoatrial node) is the primary pacemaker of the heart and initiates the heartbeat. Damage to this area would cause the most severe impairment of the primary pacemaker cells. The AV node (atrioventricular node) and Bundle of His can also generate impulses, but not as rapidly as the SA node. Damage to the ventricles would affect the contraction of the heart muscle, but not necessarily the generation of impulses.

A 50-Year-Old Female Received Trauma to the Chest That Caused