Where are the receptors for neurotransmitters located in the heart?
A)Semilunar and atrioventricular valves
B)Endocardium and sinoatrial node
C)Myocardium and coronary vessels
D)Epicardium and atrioventricular node

Question

Quizplus · Accepted Answer

Sympathetic neural stimulation of the myocardium and coronary vessels depends on the presence of adrenergic receptors, which bind specifically with neurotransmitters of the sympathetic nervous system. The β₁-receptors are found mostly in the heart, specifically the conduction system (AV and SA nodes, Purkinje fibers) and the atrial and ventricular myocardium, whereas the β₂-receptors are found mostly on coronary arterioles and cause coronary vasodilation when stimulated by epinephrine.

Where Are the Receptors for Neurotransmitters Located in the Heart