< b>Involuntary: Done other than in accordance with the conscious will of
the individual. The opposite of voluntary.
The terms "voluntary" and "involuntary" apply to the human nervous system and
its control over muscles. The nervous system is divided into two parts -- somatic
and autonomic. The somatic nervous system operates muscles that are under voluntary
control. The autonomic (automatic or visceral) nervous system regulates individual
organ function and is involuntary. Opening the mouth is voluntary while blushing
is involuntary.
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