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sympathetic nervous system

sym·pa·thet·ic nerv·ous sys·tem

/ˌsimpəˈTHetik ˈnərvəs ˈsistəm/

Noun

The sympathetic nervous system causes the commonly-called “fight or flight” response - where heart rate increases, blood pressure rises, and blood is channeled away from nonessential organs and into the deep skeletal muscles; all in preparation to respond to some form of stress.