As your body's emergency system, the sympathetic nervous system rapidly triggers the fight-or-flight response when a threat or danger is perceived.

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The sympathetic nervous system is responsible for the fight-or-flight response in the presence of perceived danger or threat. This response prepares the body for emergency situations by increasing heart rate, respiration, and blood pressure, among other physiological changes.

As Your Body's Emergency System, the Sympathetic Nervous System Rapidly