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Definition of Sympathetic nervous system

Sympathetic nervous system: A part of the nervous system that serves to accelerate the heart rate, constrict blood vessels, and raise blood pressure. The sympathetic nervous system and the parasympathetic nervous system constitute the autonomic nervous system, the branch of the nervous system that performs involuntary functions.


Last Editorial Review: 3/26/1998 2:28:00 PM

Common Misspellings: sympathetic nervious system

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