PATHOLOGY

Detailed explanation-1: -The electrical impulse travels from the sinus node to the atrioventricular node (also called AV node). There, impulses are slowed down for a very short period, then continue down the conduction pathway via the bundle of His into the ventricles.

Detailed explanation-2: -The bundle branches then divide into an extensive system of Purkinje fibers that conducts the impulses at high velocity (about 4 m/sec) throughout the ventricles. This results in rapid depolarization of ventricular myocytes throughout both ventricles.