Answer: Acetylcholine (Ach)
Explanation:
The axon terminals of the motor neurons release acetylcholine which is a neurotransmitter.
These cells are specialized to release this chemical messenger of presynaptic cell. The terminal release transmitter substance into the gap called as synaptic cleft which lies in between terminal and the dendrites of the of the next neuron.
Neurons do not come directly in contact in with each other they transfer signal cross synapse.
