FISDAP Cardiology Practice Test

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards

From $25.99Unlock all

Session length

1 / 20

What is the primary function of the atrioventricular (AV) node?

To initiate heart contractions

To relays electrical impulses from the atria to the ventricles

The primary function of the atrioventricular (AV) node is to relay electrical impulses from the atria to the ventricles. This structure is crucial for maintaining the proper sequence of heart contractions. When the sinoatrial (SA) node generates an electrical impulse, it first causes the atria to contract and push blood into the ventricles. The AV node serves as a critical gateway that slows down the electrical signal before it is transmitted to the ventricles. This slight delay allows the ventricles enough time to fill with blood before they contract.

By performing this relay function, the AV node plays an essential role in ensuring that the heart functions efficiently and effectively, allowing for coordinated contractions of the heart chambers. This sequence helps regulate the heart's rhythm and overall performance.

To increase heart rate

To regulate blood flow