In the normal conduction sequence, which structure is the final common pathway delivering impulse to the ventricles?

• A. SA Node
• B. AV Node
• C. Bundle of His
• D. His-Purkinje System

Answer: (D)

The final common pathway for ventricular activation is the His-Purkinje system. After the impulse passes through the AV node, it travels down the bundle of His and rapidly spreads through the right and left bundle branches into the Purkinje fibers. This Purkinje network distributes the impulse quickly to all ventricular myocardium, producing near-simultaneous depolarization and coordinated contraction. The bundle of His serves as the main conduit between the AV node and the ventricles, but the actual rapid delivery to the ventricular muscle comes from the Purkinje system. The SA node and AV node set pace and provide a delay, respectively, but are not the pathways delivering impulse to the ventricles.