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

Question

Quizplus · Accepted Answer

Sympathetic neural stimulation of the myocardium and coronary vessels depends on the presence of adrenergic receptors, which specifically bind with neurotransmitters of the sympathetic nervous system. The b₁ 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 b₂ receptors are found in the heart and also on vascular smooth muscle. b₃ receptors are also found in the myocardium and coronary vessels. This selection is the only option that accurately identifies the location of the receptors for neurotransmitters.

Where in the Heart Are the Receptors for Neurotransmitters Located