What physiological effect does adenosine have on the AV node?

Adenosine plays a significant role in the regulation of cardiac function, particularly in the conduction system of the heart. When adenosine interacts with the AV node, it primarily inhibits impulse conduction. This effect is essential for controlling the heart rate and can be particularly important during conditions of supraventricular tachycardia, where rapid heart rhythms may arise.

By inhibiting conduction through the AV node, adenosine effectively slows down the transmission of electrical impulses from the atria to the ventricles. This results in a decrease in heart rate and a potential restoration of normal sinus rhythm in cases of tachycardia. The inhibition of conduction is a protective mechanism that helps prevent excessive heart rates and maintains an appropriate interplay between atrial and ventricular contractions.

Overall, the action of adenosine on the AV node serves as a crucial physiological process for maintaining cardiac stability and rhythm control.