Recent Examples of sympathetic nervous system from the Web
This produces a stress response in your body—specifically, your brain’s hypothalamus triggers your sympathetic nervous system to release norepinephrine (aka adrenaline) and cortisol (a stress hormone) to get you out of harm’s way.
Your sympathetic nervous system, which causes blood vessels to narrow, is the source of this mechanism.
Most researchers agree that rest is a physiological state during which your innate fight-or-flight stress response, or sympathetic nervous system, subsides in favor of a more relaxed condition.
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medical Definition of sympathetic nervous system
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Britannica.com: Encyclopedia article about sympathetic nervous system
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