Acetylcholine (W) Pillow

Acetylcholine or ACh is an organic compound used by all sorts of living organisms for a variety of functions; in humans (and many other animals) it acts as a neurotransmitter that operates at the junction of muscle and motor nerve, and is the chemical that activates muscle fibres to contraction. ACh is released by the nervous system as part of the relaxation response. This is process is often summarized as “rest and digest” or “feed and breed” as ACh plays a crucial role in digestion, arousal, reward, resting, and feeling relaxed and tranquil. White version.