The function of the ventricular conduction system of the heart is to
A) spread the action potential throughout the ventricle to ensure a single, coordinated contraction of the both ventricles
B) spread the action potential in the absence of sympathetic stimulation
C) spread the action potential throughout the atria and ventricles
D) slow down the original action potential so it has time to spread through the ventricles evenly
E) spread the action potential throughout the ventricle to ensure a single, coordinated contraction of the both ventricles, and slow down the original action potential so it has time to spread through the ventricles evenly

Question

Quizplus · Accepted Answer

The ventricular conduction system is responsible for spreading the action potential throughout the ventricles to ensure a single, coordinated contraction of both ventricles. This is achieved through the network of specialized cardiac muscle cells that make up the conduction system, including the bundle of His, Purkinje fibers, and moderator band. The conduction system also plays a role in slowing down the action potential to ensure it has time to spread through the ventricles evenly, but this is not its primary function. Option B is incorrect as sympathetic stimulation has no bearing on the proper function of the conduction system. Option C is partly correct, but only the spread of the action potential in the ventricles is the function of the conduction system. Option D is incorrect as the conduction system does not slow down the original action potential, but rather ensures its proper spread through the ventricles. Option E is partly correct, but the primary function of the conduction system is to ensure a single, coordinated contraction of both ventricles.

The Function of the Ventricular Conduction System of the Heart