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.)
-the only point of electrical contact between the atria and ventricles

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