Question

multiple choice question
which structures in the heart are innervated by the autonomic nervous system?
o av node only
o sa node, av node, myocardium
o sa and av nodes only
o myocardium only
o sa node and myocardium only
o sa node only

Explanation:

The autonomic nervous system innervates the sino - atrial (SA) node, atrioventricular (AV) node, and myocardium of the heart. The SA node is the natural pacemaker, the AV node conducts electrical impulses from atria to ventricles, and the myocardium is the muscular tissue of the heart. The autonomic nervous system regulates the heart rate, contractility, and conduction velocity by acting on these structures.

Answer:

SA node, AV node, myocardium