Final answer:
Once the electrical impulse travels through the atrioventricular bundle, it proceeds to the left and right bundle branches. These branches transfer the impulse to the Purkinje fibers which ultimately lead to ventricular contraction.
Step-by-step explanation:
After an electrical impulse travels through the atrioventricular bundle, or the bundle of His, it then reaches the bundle branches. These bundle branches, which consist of specialized myocardial conductile cells, split into the left and right parts. The left bundle branch is larger and supplies the left ventricle while the right bundle branch supplies the right ventricle. The impulse continues down these branches and reaches the right papillary muscle via the moderator band, before being transmitted to the Purkinje fibers. These fibers then spread the impulse to the contractile fibers of the heart's ventricles, triggering ventricular contraction. This entire conduction process ensures the proper, coordinated contraction of the heart necessary for effective blood pumping.