The release of ________ to muscle cell receptors triggers muscle contractions.
A) ACh
B) serotonin
C) dopamine
D) adrenaline

Question

Quizplus · Accepted Answer

ACh (acetylcholine) is the primary neurotransmitter released by motor neurons that triggers muscle contractions by binding to muscle cell receptors known as nicotinic receptors. Serotonin, dopamine, and adrenaline are not directly involved in triggering muscle contractions.

The Release of ________ to Muscle Cell Receptors Triggers Muscle