The timing of the spread of the action potential from atrium to ventricle is controlled by the
A) sinoatrial node.
B) atrioventricular node.
C) Purkinje fibers.
D) bundle of His.
E) ventricular mass.

Question

Quizplus · Accepted Answer

The atrioventricular (AV) node acts as a delay in the conduction of the action potential from the atrium to the ventricle, allowing time for the atria to contract and empty their blood into the ventricles before ventricular contraction occurs. Therefore, the timing of the spread of the action potential from atrium to ventricle is controlled by the AV node.

The Timing of the Spread of the Action Potential from Atrium