What is released by axon terminals into the synaptic cleft to stimulate a muscle to contract?
A) potassium ions
B) actin
C) sodium ions
D) acetylcholine
E) myosin heads

Question

Quizplus · Accepted Answer

Acetylcholine is the neurotransmitter that is released by the axon terminals of the motor neurons into the synaptic cleft. It binds to receptors on the muscle cell membrane, triggering a series of events that ultimately result in muscle contraction.

What Is Released by Axon Terminals into the Synaptic Cleft