The normal pattern of impulse conduction through the heart is:
A) AV node, SA node, bundle of His, and Purkinje fibers.
B) AV node, SA node, Purkinje fibers, and bundle of His.
C) SA node, AV node, Purkinje fibers, and bundle of His.
D) SA node, AV node, bundle of His, and Purkinje fibers.

Question

Quizplus · Accepted Answer

The normal pattern of impulse conduction through the heart is initiated by the SA node, then travels through the AV node, to the bundle of His, and finally to the Purkinje fibers which spread the electrical impulse through the ventricles, causing them to contract. Therefore, the correct order is SA node, AV node, bundle of His, and Purkinje fibers, which is represented by choice D.

The Normal Pattern of Impulse Conduction Through the Heart Is