Most of the major muscle groups used or movement and communication are voluntary. Involuntary muscles would be things like your heart and the muscles around your intestines, which you generally cannot consciously control. The skeletal is called voluntary muscle because it is usually subject to conscious control.
Medical Definition of Autonomic nervous system. Autonomic nervous system: A part of the nervous system that regulates key involuntary functions of the body, including the activity of the heart muscle; the smooth muscles, including the muscles of the intestinal tract; and the glands.
The ANS (Autonomic Nervous System) is a group of nerves that connect the major physiological control centres of the brain to practically all the bodyâs tissues and organs. The ANS can be separated into the sympathetic and parasympathetic nervous system. The Sympathetic nervous system is concerned with bodily mobilization and the expenditure of energy. It controls the commonly named âflight or fightâ response; that is, it prepares us for physical action to respond to emergency situations.