What are the myocardial fibers involved in the impulse conduction system of the heart known as?

The myocardial fibers that are specifically involved in the impulse conduction system of the heart are known as Purkinje fibers. These fibers play a crucial role in the electrical conduction system, which is responsible for coordinating the heart's contractions. Purkinje fibers are specialized conductive fibers that are essential for rapidly conducting electrical impulses from the bundle of His through the ventricles, ensuring that they contract in a synchronized manner after receiving signals from the atria. This precise timing is vital for maintaining an effective and efficient heartbeat.

While muscle fibers refer to the general type of cells that make up the heart (and include both contractile and conducting fibers), and contractile fibers are those that generate the contraction of the heart muscle, neither specifically highlights the role of impulse conduction as Purkinje fibers do. Ventricular fibers, on the other hand, may refer to the muscle fibers in the ventricular walls themselves but do not encompass the specialized conductive function that is the hallmark of Purkinje fibers. Hence, the designation of Purkinje fibers is what accurately identifies those involved in the heart's impulse conduction system.