Is released by motor nerve endings onto muscle.

Acetylcholine

Norepinephrine

Dopamine

Serotonin

Acetylcholine

Explanation:

Acetylcholine (ACH) is a neurotransmitter hormone produced by the nervous system (central and peripheral), which is released by the motor nerve endings in the muscle. It is a simple molecule produced in the cytoplasm of nerve endings, being derived from choline (component of lecithin), which arises from its reaction with acetyl-CoA in the presence of the enzyme choline acetyl transferase (ChAT).

This hormone acts in various parts of the body as a messenger between nerve cells, and its main effects are on the cardiovascular system, excretory system, respiratory system, muscle system and the brain.