It means that you do not have conscious control over it. Involuntary systems include ones such as digestion and circulation. You cannot tell your body when or how fast to digest your food, and it isn't possible to consciously tell your heart how fast to beat.
involuntary
involuntary
The endocrine system is involuntary. A person cannot control the endocrine system by will.
Subdivision of the peripheral nervous system that regulates involuntary functions.
Involuntary actions of the body are controlled by the autonomic nervous system.
nervous system
Involuntary, as we are not conscious of pushing food through the digestive system.
Of course! Involuntary when you don't have a mental illness.
It would be better to ask what part(s) control voluntary action. In general, everything is involved with involuntary actions. If you mean muscle activity (actions), then the typical answer is the involuntary nervous system, specifically the autonomic nervous system, in which there are two main parts (as determined by nervous transmitters and function). (For example, the Sympathetic nervous system.) But there are chemical responses controled too.
voluntary
Nerves
Involuntary actions of the body are controlled by the autonomic nervous system.