Which of these statements correctly describes the AV node?
A)It is the normal pacemaker of the heart.
B)It is the only electrical connection between the atria and the ventricles.
C) It rapidly conducts the impulse from the atria to the ventricles so that they contract simultaneously.
D) It is not innervated by the vagus.

Question

Quizplus · Accepted Answer

The AV node is the only electrical connection between the atria and the ventricles. It receives electrical impulses from the SA node in the atria and delays their transmission to the ventricles, allowing time for the atria to fully contract before the ventricles begin to contract. This ensures efficient blood flow through the heart. However, it is not the normal pacemaker of the heart, as the SA node typically sets the heart rate. It also does not rapidly conduct the impulse, as it is intentionally slowed down by the AV nodal delay. The AV node is innervated by the vagus nerve, so choice D is also incorrect.

Which of These Statements Correctly Describes the AV Node