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Stress is a reaction to an event of psychological or physiological origin. Psychologically, stress is defined as a reaction that occurs when the demands of one’s environment are perceived to be greater than the amount of coping skills possessed. Physiologically, stress can be defined as the coactivation of the sympathetic adrenal medullary and the hypothalamic-pituitary-adrenal axes by a physical stimulus that is perceived by the body as threatening. This leads to an activation of the sympathetic nervous system, which engages a fight-or-flight response and disrupts homeostasis. Stressors are the triggers for the complex chain of events that take place in both the mind and the body. Both psychological and physical stressors, as well as short- and long-term stressors, contribute to this chain of events. ...

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