A 50-year-old received trauma to the chest that caused severe impairment of the primary pace-maker cells of the heart. Which of the following areas received the greatest damage?
a. Atrioventricular (AV) node
b. Sinoatrial (SA) node
c. Bundle of His
d. Ventricles
ANS: B
The SA node, not the AV node, is considered the pacemaker of the heart. Neither the bundle of His nor the ventricles are involved.
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