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autonomic nervous system

The definition of an autonomic nervous system is the bodily process that controls all involuntary actions such as breathing and digestion.

(noun)

An example of an autonomic nervous system is someone's constant heartbeat and breathing while they sleep.

See autonomic nervous system in Webster's New World College Dictionary

the part of the nervous system that is responsible for control and regulation of the involuntary bodily functions, including those of the heart, blood vessels, visceral smooth muscles, and glands: it consists of the sympathetic system which, in general, stimulates the body to prepare for physical action or emergency, and the parasympathetic system which, in general, stimulates the opposite responses

See autonomic nervous system in American Heritage Dictionary 4

noun

The part of the vertebrate nervous system that regulates involuntary action, as of the intestines, heart, and glands, and that is divided into the sympathetic nervous system and the parasympathetic nervous system.

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