The (ortho-) sympathetic nervous system (SNS) is one of the three parts of the autonomic nervous system, along with the enteric and parasympathetic systems. Its general action is to mobilize the body's nervous system fight-or-flight response. It is, however, constantly active at a basic level to maintain homeostasis.
Read more about Sympathetic Nervous System: Overview, Function, Organization, Information Transmission, Sympathicotonia
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