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

Question

Quizplus · Accepted Answer

The ventricular conduction system is responsible for spreading the action potential throughout the large ventricular mass. This ensures that the ventricles contract in a coordinated manner, which is essential for efficient pumping of blood out of the heart. Option B is incorrect because sympathetic stimulation can enhance, rather than replace, the normal conduction system. Option C is incorrect because heart rate is primarily controlled by the autonomic nervous system, not the conduction system. Option D is incorrect because the atria also have their own conduction system (the sinoatrial and atrioventricular nodes). Finally, option E is incorrect because the conduction system actually speeds up the spread of the action potential, rather than slowing it down.

The Function of the Ventricular Conduction System of the Heart