Which substance is released by motor neurons to stimulate a contraction?
A) myosin
B) acetylcholine
C) dopamine
D) calcium

Question

Quizplus · Accepted Answer

Motor neurons release acetylcholine to stimulate a contraction in muscle fibers. Acetylcholine binds to receptors on the muscle fiber's membrane, causing the membrane to depolarize and initiate a muscle contraction. Myosin is a protein within the muscle fiber that assists in muscle contraction by interacting with actin. Dopamine is a neurotransmitter involved in the reward and motivation pathways of the brain. Calcium is also involved in muscle contraction as it binds to regulatory proteins, allowing for the interaction of myosin and actin. However, it is not the substance released by motor neurons to stimulate a contraction.

Which Substance Is Released by Motor Neurons to Stimulate a Contraction