Match the Factor Involved in the Initiation and Spread of Cardiac

Multiple Choice

Match the factor involved in the initiation and spread of cardiac excitation, labelled a. through d. with the description. (Options may be used more than once or not at all.)
-rapidly conducts the impulse down the ventricular septum and throughout much of the ventricular musculature

A) SA node
B) AV node
C) bundle of His and Purkinje system
D) gap junction