Where do the Purkinje fibers transmit the electrical impulses from and to?

The Purkinje fibers play a crucial role in the conduction system of the heart, specifically in how electrical impulses are transmitted through the ventricles. They are specialized fibers that extend from the bundle branches throughout the ventricular myocardium. Their primary function is to carry electrical impulses from the atrioventricular (AV) node to the myocardial tissue of the ventricles.

When the AV node receives an impulse, it serves as a gateway that allows the signal to pause briefly before traveling through the bundle of His and then along the left and right bundle branches. The Purkinje fibers then distribute the electrical impulse rapidly and efficiently to all areas of the ventricles, resulting in coordinated contraction of the heart muscle. This action ensures that the ventricles contract in a synchronized manner to efficiently pump blood out of the heart.

This understanding clarifies why the correct answer is centered on the transmission from the AV node to the myocardial tissue, highlighting the integration of the electrical conduction system in maintaining proper heart function.