What is the purpose of the AV node in the cardiac conduction system?

What is the purpose of the AV node in the cardiac conduction system?

• A. To generate a rapid heart rate
• B. To slow conduction and allow ventricular filling
• C. To direct blood flow
• D. To enhance atrial contraction

Answer: (B)

The AV node plays a crucial role in the cardiac conduction system by slowing down the electrical impulses that travel from the atria to the ventricles. This delay is essential for allowing adequate time for the ventricles to fill with blood from the atria before they contract. By moderating the speed of conduction, the AV node ensures that the heart functions efficiently, coordinating the timing of atrial and ventricular contractions. This function is critical in maintaining effective blood flow and proper heart rhythm. The other options, while related to aspects of heart function, do not accurately describe the specific role of the AV node in the conduction pathway.