The timing of the spread of the action potential from atrium to ventricle is controlled by
A) the sinoatrial node.
B) the atrioventricular node.
C) modified muscle cells of the conducting system.
D) systolic contractions.
E) the ventricular mass.

Question

Quizplus · Accepted Answer

The spread of the action potential from atrium to ventricle is controlled by the atrioventricular node which serves as a gatekeeper, delaying the electrical signal from the atria to the ventricles to allow adequate time for atrial contraction and ventricular filling before ventricular contraction.

The Timing of the Spread of the Action Potential from Atrium