Damage to the ________ causes heart block.
A) sinoatrial (SA) node
B) atrioventricular (AV) node
C) atrioventricular (AV) bundle
D) atrioventricular (AV) valves

Question

Quizplus · Accepted Answer

Heart block occurs when there is an interruption in the electrical signals between the atria and the ventricles. The AV node is the primary site for this electrical signal to be slowed down before it reaches the ventricles. Damage to the AV node can cause heart block. The SA node is responsible for initiating the electrical signal, the AV bundle and its branches are responsible for transmitting the signal to the ventricles, and the AV valves regulate blood flow between the atria and ventricles but do not play a primary role in the electrical conduction system.

Damage to the ________ Causes Heart Block