Question

multiple choice question
which structures in the heart are innervated by the autonomic nervous system?

sa node and myocardium only
av node only
sa node only
sa and av nodes only
myocardium only
sa node, av node, myocardium

Explanation:

The autonomic nervous system innervates the sino - atrial (SA) node, atrioventricular (AV) node, and myocardium. The SA node is the natural pacemaker, the AV node relays electrical signals, and the myocardium is the heart muscle. Autonomic innervation helps regulate heart rate, conduction, and contractility.

Answer:

SA node, AV node, myocardium