The fight-or-flight response is triggered by the sympathetic branch of the autonomic nervous system.

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The fight-or-flight response is indeed triggered by the sympathetic branch of the autonomic nervous system. When the body perceives a threat or stressor, the sympathetic nervous system activates a cascade of physiological responses including increased heart rate, respiratory rate, and blood pressure, as well as the release of adrenaline and other stress hormones. These responses are aimed at preparing the body to either fight the threat or flee from it.

The Fight-Or-Flight Response Is Triggered by the Sympathetic Branch of the Autonomic