The direction of the impulse through the conduction system of the heart is normally:
A) AV node¾SA node¾bundle of His¾Purkinje fibers
B) AV node¾bundle of His¾SA node-¾Purkinje fibers
C) bundle of His¾AV node¾Purkinje fibers¾SA node
D) SA node¾AV node¾bundle of His¾Purkinje fibers
E) SA node¾bundle of His¾Purkinje fibers¾AV node

Question

Quizplus · Accepted Answer

The impulse travels through the SA node (sinoatrial node), then to the AV node (atrioventricular node), then to the bundle of His, and finally to the Purkinje fibers. Therefore, the correct direction of impulse transmission is SA node¾AV node¾bundle of His¾Purkinje fibers, which is option D.

The Direction of the Impulse Through the Conduction System of the Heart