Which structure carries impulses from the AV node to the ventricles?

Which structure carries impulses from the AV node to the ventricles?

• A. AV bundle (bundle of His)
• B. SA node
• C. Purkinje fibers
• D. Atrioventricular valve apparatus

Answer: (A)

The AV bundle (bundle of His) is the direct conduction pathway from the AV node to the ventricles. After the AV node briefly delays the impulse to allow atrial contraction, the impulse travels into this bundle, which runs through the fibrous skeleton into the interventricular septum and splits into the right and left bundle branches. These branches then transmit the impulse to the Purkinje fibers, rapidly activating the ventricular myocardium for coordinated contraction. The SA node initiates impulses but doesn’t carry them to the ventricles; Purkinje fibers are the final rapid spreaders within the ventricles; the atrioventricular valve apparatus isn’t involved in conduction.

The AV bundle (bundle of His) is the direct conduction pathway from the AV node to the ventricles. After the AV node briefly delays the impulse to allow atrial contraction, the impulse travels into this bundle, which runs through the fibrous skeleton into the interventricular septum and splits into the right and left bundle branches. These branches then transmit the impulse to the Purkinje fibers, rapidly activating the ventricular myocardium for coordinated contraction. The SA node initiates impulses but doesn’t carry them to the ventricles; Purkinje fibers are the final rapid spreaders within the ventricles; the atrioventricular valve apparatus isn’t involved in conduction.