Muscarinic receptors
A) are normally activated by acetylcholine.
B) are found mostly in autonomic ganglia.
C) always produce an excitatory response.
D) control sodium channels in the affected membrane.
E) are blocked by norepinephrine.

Question

Quizplus · Accepted Answer

Muscarinic receptors are normally activated by acetylcholine, a neurotransmitter released by parasympathetic nerves.

Answer: False statement. 
 B is false, muscarinic receptors are found in various parts of the body, including the heart, smooth muscle, and glands.

Answer: False statement. 
 C is false, activation of muscarinic receptors can produce either an excitatory or inhibitory response depending on the tissue and conditions.

Answer: False statement. 
 D is false, muscarinic receptors do not directly control sodium channels.

Answer: False statement. 
 E is false, muscarinic receptors are not blocked by norepinephrine, they are targeted by acetylcholine.

Muscarinic Receptors