Science glossary film: Involuntary

As opposed to voluntary, an involuntary action is one that happens without any conscious control. For example, a reflex response, or anything that someone does in their sleep. The involuntary nervous system controls most of our vital biological processes, from digestion and breathing to blood circulation, without us thinking about it.

For example, a reflex response, or anything that someone does in their sleep. The involuntary nervous system controls most of our vital biological processes, from digestion and breathing to blood circulation, without us thinking about it.