Question

internodal pathways:
○ connect the av node to the purkinjie fibers.
○ connect the sa node to the av node.
○ connect the bundle of his to the purkinjie fibers.
○ all of the above.
○ none of the above.

Explanation:

To determine the correct answer, we analyze the function of internodal pathways in the cardiac conduction system. Internodal pathways are specific to conducting electrical impulses between the SA (sinoatrial) node and the AV (atrioventricular) node.

• The first option is incorrect because the connection from the AV node to Purkinje fibers is via the Bundle of His and its branches, not internodal pathways.
• The third option is incorrect as the Bundle of His to Purkinje fibers connection is part of the ventricular conduction system, not internodal.
• The "all of the above" option is incorrect since not all statements are true.
• The "none of the above" option is incorrect because the second statement (connecting SA to AV node) is correct.

Answer:

B. connect the SA node to the AV node.