Autonomic Nervous System
One half of the two divisions of the peripheral nervous system responsible for involuntary body functions such as breathing, heartbeat, digestion, etc.
—Relating to Part of the ANS that counterbalances sympathetic nerves. It is made of the never arising from the brain and lower end of the spinal cord while supplying the internal organs, blood vessels and glands
—The other division of the ANS stimulates the body's fight-or-flight response