fight-or-flight response


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fight-or-flight response

(fīt′ôr-flīt′)
n.
A set of physiological changes, such as increases in heart rate, arterial blood pressure, and blood glucose, initiated by the sympathetic nervous system to mobilize body systems in response to stress.

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.

fight-or-flight response,

n the psychophysiologic response to a perceived threat that prepares the organism for action.
References in periodicals archive ?
Since the fight-or-flight response is designed for physical action, regular exercise is a great way of dissipating the physical manifestations of stress hormones in the body.
Depression is a state of arousal - the fight-or-flight response is active in depressed people,'' said Chris Strychacz of the University of Missouri, Kansas City.
The response spurs the opposite effect on the body of the fight-or-flight response produced by fear (see p.
These hormones, which are central to the body's fight-or-flight response, cause the heart to beat faster and more forcefully.
Cortisol is part of the body's fight-or-flight response.
This is known as the fight-or-flight response, says Dr.
That reaction is natural, part of the fight-or-flight response programmed into many animals.