In atrial fibrillation, random waves of impulses within the atrial myocardium cause irregular stimulation of the ________, leading to irregular ventricular systole.
A) AV node
B) cardiac skeleton
C) SA node
D) AV valves

Question

Quizplus · Accepted Answer

In atrial fibrillation, irregular waves of impulses within the atrial myocardium lead to irregular stimulation of the atrioventricular (AV) node, which then causes irregular ventricular systole. The cardiac skeleton is a structure within the heart that provides support and separates the atria from the ventricles, but it is not directly involved in the conduction of impulses during atrial fibrillation. The sinoatrial (SA) node is responsible for initiating the electrical impulses that regulate heart rhythm, but in atrial fibrillation, the irregular impulses originate in the atrial myocardium rather than the SA node. The AV valves control blood flow between the atria and ventricles, but they are not directly involved in the conduction of impulses during atrial fibrillation.

In Atrial Fibrillation, Random Waves of Impulses Within the Atrial