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.
References in periodicals archive ?
class="MsoNormalImpatience, bad temper and anger are part of your fight-or-flight response, and are intended to help you deal with dangerous predators.
When I checked the meaning of stress, one definition included the response to stress, i.e., it induces a fight-or-flight response. So, how do we respond to stress or tension?
When your survival is on the line, these biological changes come on strong, and you may find yourself having a classic fight-or-flight response. But when the stressful situation is less threatening, the brain and body shifts into a different state: a challenge response.
The survivors and controls differed in mean arterial blood pressure, heart rate, variability of heart rate, and levels of cortisol, a regulatory substance that promotes the fight-or-flight response; as well as levels of interleukin-2 and interleukin 6.
"Mother Nature gave us the fight-or-flight response to help us, not kill us," Professor Firdaus Dhabhar, who led the research, said.
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. When a horse is frightened or excited, its body releases the hormone adrenaline.
A fast pulse, vessel constriction, and high blood pressure are valuable tools in a person's fight-or-flight response. But if high norepinephrine concentrations chronically Keep a person in that state, it puts a strain on the heart, says Mitchel A.
This counters the fight-or-flight response of the sympathetic nervous system, or even the overstimulation caused by a long performance season.