Which subdivision enacts the Fight or Flight response?

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Fight or Flight is produced by the sympathetic division of the autonomic nervous system. When a threat is perceived, this branch activates rapid changes to the body—heart rate increases, airways dilate, pupils widen, and blood is redirected toward muscles—to prepare for quick action. The autonomic nervous system includes both sympathetic and parasympathetic pathways, but only the sympathetic branch drives this specific arousal response. The parasympathetic branch promotes rest and digestion, which is the opposite state, while the central nervous system (brain and spinal cord) sends the commands but does not alone enact the physiological changes of Fight or Flight.