EVERYDAY SCIENCE

Detailed explanation-1: -Digestion: The PSNS stimulates the release of saliva to promote digestion.

Detailed explanation-2: -The parasympathetic system turns up the flow of saliva by releasing a chemical, acetylcholine, which stimulates the glands to make more saliva. If these glands get diseased, damaged, or affected by drugs, they may not make enough saliva, leading to dry mouth.

Detailed explanation-3: -Your parasympathetic nervous system is a network of nerves that relaxes your body after periods of stress or danger. It also helps run life-sustaining processes, like digestion, during times when you feel safe and relaxed.

Detailed explanation-4: -The parasympathetic nervous system is responsible for the unconscious regulation of salivation, lacrimation, urination, digestion, and defecation (acronym SLUDD) [16]. Most of the nerves of the parasympathetic nervous system come from the brain stem and some from sacral spinal cord.

Detailed explanation-5: -In the stomach and intestines, parasympathetic stimulation of M receptors leads to increased motility and relaxation of sphincters. Stimulation of M receptors also increases gastric secretions to aid in digestion. In the gallbladder, parasympathetic stimulation of M3 receptors stimulates contraction to release bile.