Muscarinic Receptors Are

Question

Muscarinic receptors are
A) activated by norepinephrine.
B) located on the effector organs of the sympathetic nervous system.
C) activated by catecholamines such as adrenalin and dopamine.
D) activated by ACh.

Accepted Answer

Muscarinic receptors are activated by acetylcholine (ACh), not norepinephrine (A), which activates adrenergic receptors. They are also located on the effector organs of the parasympathetic nervous system, not the sympathetic nervous system (B). While catecholamines such as adrenaline and dopamine may have some effect on muscarinic receptors, they are not the primary activators.