By Sheryl Ankrom, About.com
Updated: June 23, 2008
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
The Autonomic Nervous System (ANS) is an unconscious control system that helps the body maintain a stable, constant condition and adapt to stressful situations. The ANS controls heart rate, digestion, respiration rate, salivation, perspiration, diameter of the pupils, urination, and sexual arousal.
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