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1. the part of the nervous system of vertebrates that controls involuntary actions of the smooth muscles and heart and glands (noun.body)
| hypernym | : | neural structure, |
| definition | : | a structure that is part of the nervous system (noun.body) |
| part holonym | : | autonomic ganglion, |
| definition | : | any of the ganglia of the autonomic system whose unmyelinated fibers innervate the internal organs (noun.body) |
| part holonym | : | sympathetic nervous system, |
| definition | : | originates in the thoracic regions of the spinal cord; opposes physiological effects of the parasympathetic: reduces digestive secretions; speeds the heart; contracts blood vessels (noun.body) |
| part holonym | : | parasympathetic, parasympathetic nervous system, |
| definition | : | 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 (noun.body) |
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