The binding of __________ to a nicotinic receptor of a muscle fiber will __________ it.
A) acetylcholine;excite
B) norepinephrine;excite
C) monoamine oxidase;inhibit
D) acetylcholine;inhibit
E) acetylcholinesterase;excite

Question

Quizplus · Accepted Answer

Acetylcholine is the neurotransmitter that binds to nicotinic receptors on muscle fibers, causing them to be excited and contract. Norepinephrine binds to adrenergic receptors, not nicotinic receptors. Monoamine oxidase is an enzyme that breaks down neurotransmitters and is not involved in receptor activation. Acetylcholinesterase is an enzyme that breaks down acetylcholine and would not excite a muscle fiber.

The Binding of __________ to a Nicotinic Receptor of a Muscle