What type of fibers carry impulse to distant regions of the ventricular myocardium?

Purkinje fibers are specialized cardiac muscle fibers that play a crucial role in the heart's conduction system. They are responsible for rapidly conducting electrical impulses to the distal regions of the ventricular myocardium. This rapid conduction ensures that the ventricles contract in a coordinated manner, allowing for an efficient and synchronized pumping action of the heart.

These fibers emerge from the bundle branches of the atrioventricular (AV) bundle, and they spread through the ventricular walls, allowing them to stimulate the myocardium effectively, leading to a strong and consistent ventricular contraction. The distinct structure of Purkinje fibers—being larger in diameter and having fewer myofibrils compared to typical cardiac muscle cells—facilitates their rapid conduction ability.

While other types of fibers, such as cardiac fibers and conducting fibers, may also participate in the excitation-contraction coupling and the conduction system, it is the Purkinje fibers that are specifically tailored for conveying impulses throughout the ventricles promptly. This specialization makes them essential for proper heart function during each cardiac cycle.