Stress - the physiological reaction of the organism to environmental changes, as well as one of the mechanisms of adaptation and a prerequisite of survival in an ever-changing world.In the course of evolution, one of the conditions of survival had the ability to cope with stressors and be able to best adapt to the environment.Due to stress a person has incredible adaptability: people can live in any climate and ecosystem at any height, to cope with almost any predator.Man has learned to survive in any situation and to adapt to any environment.So what is the bad stress?
Stress also leads to disruption of homeostasis - the dynamic balance of the internal environment of the body.Any impact of the external environment, whether the temperature changes or the threat of being eaten by a predator, disturb this balance and require an
Scientists vysnit that under the influence of stress in animals and in humans are released from the adrenal powerful neurotransmitters epinephrine and norepinephrine.It is thanks to them carried out the reaction of "fight or flight".The body is instantly on alert: quickens the heartbeat, exacerbated all the feelings, thinking becomes clearer, muscles come in tone, easy to straighten out, pupils dilate.The released under stress neurotransmitters affect virtually all tissues and organs, trying to prepare the body for any unforeseen eventuality.Indeed, such training can often save lives.Recall at least all those stories about the people who at the time of large-scale accidents and disasters do incredible things.
Stress and hormones secreted under its influence, cause the body to function at their best.Therein lies its danger.
early as 1954, Hans Selye described the process of adaptation to change, the so-called "adaptation syndrome", and singled him three stages.
First - alarm phase, during which the body produces hormones in response to an external stimulus.The second - adaptation, during which, thanks to the use of resources, the body cope with the changes and adapt to them.Third - exhaustion.Too frequent or prolonged exposure to stressors body reserves are depleted, which can lead to various pathologies.
modern world is replete with all sorts of stressors, he changes so fast that adapt is becoming harder and harder.Moreover, modern stress often psychological in nature: hard work, school exams, family quarrels.Constant stress inevitably leads to exhaustion and disease.That is why in the XXI century stress the reputation of the worst enemy of humanity.
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