An action potential spreads through the atria by gap junctions, but there are no gap junctions present in the ventricles, so the impulse must be propagated throughout the ventricular myocardium by the bundle of His and Purkinje system.

Question

Quizplus · Accepted Answer

Both the atria and ventricles have gap junctions that allow the action potential to spread. The bundle of His and Purkinje fibers help rapidly conduct the impulse through the ventricles, but gap junctions are also present in ventricular myocardium.

An Action Potential Spreads Through the Atria by Gap Junctions