The autonomic nervous system is a control system that acts largely unconsciously and regulates bodily functions such as heart rate, digestion, respiratory rate, pupillary response, urination, and sexual arousal.
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This is one half of the autonomic nervous system; it prepares the body for intense physical activity and is often referred to as the fight-or-flight response.
This is another half of the autonomic nervous system; it relaxes the body and inhibits or slows many high energy functions - often referred to as rest-and-digest or feed-and-breed activities.