Here are some of the body functions stimulated through the parasympathetic nervous system. The PSNS uses acetylcholine as its primary neurotransmitter, but other peptides may act on the PSNS as well.
Sexual arousal
Lacrimation (crying or shedding tears)
Digestion: The PSNS dilates the blood vessels of the GI system to allow for greater blood flow.
Salivation: The PSNS stimulates the salivary glands and speeds up peristalsis.
Urination and defecation