Question

The purpose of the AV node is to _______ and the purpose of the Purkinje fibers is to _______.

• A. create simultaneous atrial and ventricular depolarization; speed up transmission of the cardiac impulse into the ventricle
• B. delay ventricular depolarization relative to atrial depolarization; insulate the cardiac impulse from the general ventricular fibers
• C. delay ventricular depolarization relative to atrial depolarization; transmit the cardiac impulse to very small localized groups of ventricular fibers
• D. delay atrial depolarization relative to ventricular depolarization; transmit the cardiac impulse to very small localized groups of ventricular fibers

Answer 1

The correct option is C delay ventricular depolarization relative to atrial depolarization; transmit the cardiac impulse to very small localized groups of ventricular fibers

The AV node delays the ventricular depolarization relative to atrial depolarization, so atrial contraction occurs before ventricular contraction. The Purkinje fibers transmit the cardiac impulse to very small localized groups of ventricular fibers.