Which portion of the conduction system transmits impulses from the AV node toward the ventricles?

• A. Bundle of His
• B. Purkinje fibers
• C. AV node
• D. SA node

Answer: (A)

The main idea is the pathway that carries the impulse from the AV node down into the ventricles. After the AV node passes along the signal, the next structure that transmits it toward the ventricles is the bundle of His. This bundle runs through the interventricular septum and splits into right and left bundle branches, which then relay the impulse to the Purkinje fibers that rapidly distribute it across the ventricular myocardium to produce coordinated contraction. The SA node starts the signal, and the Purkinje network completes its distribution, but the bundle of His is the actual conduit from the AV node to the ventricles.