one of two divisions of the autonomic nervous system, along with the parasympathetic nervous system
The sympathetic nervous system is one of two major systems that automatically controls your body's basic functions, working alongside the parasympathetic nervous system. It matters because it prepares your body to respond to challenges or threats—for example, by increasing your heart rate and redirecting blood flow during stressful situations.
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via Wikipedia infobox
The sympathetic nervous system (SNS; or sympathetic autonomic nervous system, SANS, to differentiate it from the somatic nervous system) is one of the three divisions of the autonomic nervous system, the others being the parasympathetic nervous system and the enteric nervous system. The enteric nervous system is sometimes considered part of the autonomic nervous system, and sometimes considered an independent system.
The autonomic nervous system functions to regulate the body's unconscious actions. The sympathetic nervous system's primary process is to stimulate the body's fight or flight response. It is, however, constantly active at a basic level to maintain homeostasis. The sympathetic nervous system is described as being antagonistic to the parasympathetic nervous system. The latter stimulates the body to "feed and breed" and to (then) "rest-and-digest".
via PubMed
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