PATHOLOGY

Detailed explanation-1: -Acetylcholine (ACh) is an important neurotransmitter that plays a role in brain functions, such as memory, and body functions, such as muscle contractions to move your muscles. Low levels of acetylcholine are associated with memory issues and muscle disorders.

Detailed explanation-2: -In skeletal muscle, the parasympathetic nervous system releases acetylcholine neurotransmitter that leads to depolarization of skeletal muscle by increasing the concentration of sodium ion channels. The parasympathetic nervous system releases Acetylcholine neurotransmitter that acts on the cardiac muscle.

Detailed explanation-3: -When acetylcholine reaches receptors on the membranes of muscle fibers, membrane channels open and the process that contracts a relaxed muscle fibers begins: Open channels allow an influx of sodium ions into the cytoplasm of the muscle fiber.