Acetylcholine is a neurotransmitter that stimulates muscle contraction.Acetylcholine is acting as a(n)
A) endocrine signal.
B) paracrine signal.
C) autocrine signal.
D) second messenger.

Question

Quizplus · Accepted Answer

Acetylcholine is a neurotransmitter that acts locally as a paracrine signal to stimulate muscle contraction in the neuromuscular junction. It is not a hormone that travels throughout the body like an endocrine signal or acts on the same cell that secretes it like an autocrine signal. It also does not function as a second messenger in signal transduction pathways.

Acetylcholine Is a Neurotransmitter That Stimulates Muscle Contraction