Hypersomnia Foundation

Autonomic nervous system

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The autonomic nervous system (ANS) is made up of three parts: the sympathetic nervous system, the parasympathetic nervous system, and the enteric nervous system. The ANS regulates functions that are involuntary or reflexes, things that we are usually not aware of, such as heart rate and blood pressure. The ANS is most well known for regulating our flight-or-fight response when we encounter a frightening or dangerous situation.


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