Which statement best describes the relationship between AV nodal conduction and ventricular activation?

• A. Specialized pathways exist to speed ventricular activation
• B. Conduction is slower than atrial conduction
• C. There are no dedicated pathways
• D. Ventricles activate independently of AVN

Answer: (A)

The key idea is that the impulse reaches the ventricles through a specialized, fast-conducting system after a deliberate delay at the AV node. The AV node slows conduction to allow proper ventricular filling, then the impulse travels through the His-Purkinje network, which conducts rapidly and distributes the impulse quickly to the entire ventricular muscle. This rapid, coordinated spread is what ensures near-simultaneous ventricular activation.

That’s why the best description is that specialized pathways exist to speed ventricular activation—the His-Purkinje system provides fast conduction that quickly activates the ventricles after the AV node passes the impulse along. The ventricles do not activate on their own independently of this system, and there are dedicated fast pathways, not the absence of them. The delay in the AV node contrasts with the rapid activation once the impulse enters the His-Purkinje network.