The parasympathetic nervous system (PSNS, or occasionally PNS) is one of the three main divisions of the autonomic nervous system (ANS). The ANS is responsible for regulation of internal organs and glands, which occurs unconsciously. To be specific, the parasympathetic system is responsible for stimulation of "rest-and-digest" or "feed and breed" activities that occur when the body is at rest, especially after eating, including sexual arousal, salivation, lacrimation (tears), urination, digestion, and defecation. Its action is described as being complementary to that of one of the other main branches of the ANS, the sympathetic nervous system, which is responsible for stimulating activities associated with the fight-or-flight response.
Read more about Parasympathetic Nervous System: Relation To Sympathetic Nervous System, Physical Location, Sensation, Cranial Nerve Parasympathetic Paths and Control, Pelvic Splanchnic Control, Clinical Significance, Receptors
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