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Fight or flight response is a direct result of activation of the...

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amygdala. A threat or stressor can trigger the amygdala, which then sets off the sympathetic nervous system and the HPA axis (hypothalamic-pituitary-adrenal), and this cascade of reactions is the fight or flight response. The following diagram outlines the fight or flight response:

answered Apr 5, 2016 by drcarlo (295,840 points)