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fight-or-flight response |
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fight-or-flight response, n the psychophysiologic response to a perceived threat that prepares the organism for action. fight-or-flight response Flight-or-fight response, general adaptation syndrome, stress response Physiology A constellation of physiologic responses to fear or perceived stress imminent danger or anticipated pain, which triggers full-scale CNS
activation and release of 'stressors' by adrenal medulla–eg epinephrine and norepinephrine and cortex–eg corticosteroids, mineralocorticoids, kidneys–renin, pancreas–insulin Clinical Tachycardia, ↑ blood flow
to muscle, ↑ BP, muscle tone, ↑ O2 consumption, sweating, ↑ respiratory rate, tremor, pallor, ↑ inotropism, vasoconstriction, mydriasis, bronchodilation, hyperglycemia. Cf Relaxation response. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| When the once frequently needed fight-or-flight response inappropriately triggers to deal with modern stress, it can turn against the body over the long haul. So the sound of the bell and the sudden opening of the starting gate trigger the animals' natural fight-or-flight response. A fast pulse, vessel constriction, and high blood pressure are valuable tools in a person's fight-or-flight response. |
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