MICROANATOMY

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: -Muscle contraction is controlled by receptors in the muscle cell membranes that respond to the neurotransmitter acetylcholine when it is released from motor neurons. Acetylcholine receptors are also found on neurons, where they perform a variety of important functions, including modulating cognition and addiction.

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.

Detailed explanation-5: -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.