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

Question

Quizplus · Accepted Answer

The bundle of His and Purkinje system rapidly conducts the impulse down the ventricular septum and throughout much of the ventricular musculature.

Answer: D
 Gap junctions play a critical role in the spread of cardiac excitation by allowing electrical impulses to rapidly spread from cell to cell.

Answer: A 
 The SA node is the natural pacemaker of the heart and initiates the electrical activity that leads to a heartbeat.

Answer: B 
 The AV node serves as a gatekeeper for the electrical impulse, delaying it slightly to allow for proper contraction of the atria before transmitting it to the ventricles.

Match the Factor Involved in the Initiation and Spread of Cardiac