MEDICAL PHYSIOLOGY

Detailed explanation-1: -(A) Neurotransmitter (acetylcholine, ACh) released from nerve endings binds to receptors (AChRs) on the muscle surface. The ensuing depolarization causes sodium channels to open, which elicits an action potential that propagates along the cell.

Detailed explanation-2: -Acetylcholine is a neurotransmitter that plays a role in memory, learning, attention, arousal and involuntary muscle movement. Medical conditions associated with low acetylcholine levels include Alzheimer’s disease and myasthenia gravis.

Detailed explanation-3: -ACh is the chief neurotransmitter of the parasympathetic nervous system, the part of the autonomic nervous system, that contracts smooth muscles, dilates blood vessels, increases bodily secretions, and slows heart rate.

Detailed explanation-4: -Acetylcholine signals your muscles to contract. It also plays a role in memory and can affect behaviors such as motivation and attention.