Unvoluntary. The autonomic is visceral, not on command, like control of heart, respiration, digestive, urinary systems, sexual arousal, etc central is brain and spinal cord--then there is peripheral like nerves control movements of the limbs.
What they control. The central nervous system refers to the brain and the spinal cord. The autonomic nervous system is a part of the peripheral nervous system that is involved in processes related to heart rate, sweating, blood pressure, and other processes that we don't think about, aka the name "autonomic". Autonomic nervous system disorders include fainting, fast heart rate, fatigue and sweating disorders.
How does one take care of their autonomic nervous sytem. How about taking care of the parasympathetic sympathetic and central nervous system?
Intriguing question. Control of the autonomic nervous system (sympathetic and parasympathetic) probably best attained by studying biofeedback, autogenic training, and meditation. A web-based program at heartmath. Com is recommended. Otherwise, an ascetic isolated decade-long yogi sojurn in an himalayan cave can be undertaken. The idea is to train the unconscious mind to be obedient. Avoid anger and fear. Seek love.