parasympathetic nervous system
Noun
Meaning
originates in the brain stem and lower part of the spinal cord; opposes physiological effects of the sympathetic nervous system: stimulates digestive secretions; slows the heart; constricts the pupils; dilates blood vessels
Source: WordNetSynonyms
Hypernyms
Related terms
Examples
Autonomic nervous system Components and connections of the parasympathetic nervous system The autonomic nervous system controls a wide range of involuntary and unconscious body functions.
In the parasympathetic nervous system the output connections—the projections from ganglion neurons to tissues that don't belong to the nervous system—also release acetylcholine, acting on muscarinic receptors.
The sympathetic nervous system is activated in cases of emergencies to mobilize energy, while the parasympathetic nervous system is activated when organisms are in a relaxed state.
The function of the parasympathetic nervous system is to put the body in a state conducive to rest, regeneration, digestion, and reproduction: it is sometimes described using the slogans "rest and digest" or "feed and breed".