Involuntary nervous system. Definition

Medical Definition: Involuntary nervous system

The part of the nervous system that controls muscles of internal organs (like the heart, blood vessels, lungs, stomach, intestines) and glands (such as salivary and sweat glands). Part of the involuntary nervous system helps the body to rest, relax and digest food and another part helps a person to fight or escape in case of emergency. Also called autonomic nervous system and SNA.

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