Which structures make up the atrial conduction system?

Which structures make up the atrial conduction system?

• A. Only the SA node
• B. The SA node and AV node
• C. Internodal tracts in the right atrium and Bachmann's bundle
• D. Right atrium only

Answer: (C)

The atrial conduction system is primarily responsible for the electrical impulse conduction within the atria, ensuring that the heart beats efficiently and in a coordinated manner. The key structures involved in this system include the sinoatrial (SA) node, the atrioventricular (AV) node, and specific pathways like the internodal tracts and Bachmann's bundle.

Internodal tracts in the right atrium are important because they facilitate rapid conduction of impulses from the SA node to the AV node, ensuring timely activation of the heart's chambers. Bachmann's bundle serves a critical role as it transmits impulses from the right atrium to the left atrium, allowing for synchronized contraction of both atria.

This makes the choice identifying the internodal tracts and Bachmann's bundle the most comprehensive answer regarding the structures involved in the atrial conduction system. It highlights the intricate pathways that contribute to the efficiency of atrial depolarization and overall cardiac function.