The direction of the impulse through the conduction system of the heart for each cardiac cycle is normally
A) AV node-SA node-bundle of His-Purkinje fibers.
B) AV node-bundle of His-SA node-Purkinje fibers.
C) bundle of His-AV node-Purkinje fibers-SA node.
D) SA node-AV node-bundle of His-Purkinje fibers.
E) SA node-bundle of His-Purkinje fibers-AV node.

Question

Quizplus · Accepted Answer

The normal direction of the impulse through the conduction system of the heart for each cardiac cycle is SA node-AV node-bundle of His-Purkinje fibers. The SA node is the pacemaker of the heart which initiates the cardiac cycle, the impulse then passes through the atria and reaches the AV node, from here it passes through the bundle of His and Purkinje fibers to the ventricles, causing them to contract. This direction ensures coordinated and efficient pumping of blood by the heart.

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