Student Dictionary

One entry found for sympathetic nervous system.
Main Entry: sympathetic nervous system
Function: noun
: the part of the autonomic nervous system that is concerned especially with preparing the body to react to situations of stress or emergency, that controls expansion of the pupil of the eye and air passages, increases the heart rate, slows digestion, and narrows most blood vessels, and that is made up of nerve fibers that trigger the release of norepinephrine -- compare PARASYMPATHETIC NERVOUS SYSTEM

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