Strss ( B I O L O G I C A L )

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Stress is abiological term which refers to the consequences of the failure of a human or animal body to respond appropriately to motional or physical threats to the organism, whether actual or imagined. It includes a statre of alrm and adrenaline production, short-term resistance as a coping mechanism, and exhaustion,It refers to the inability of a human or nimal body to respond. Common stress symptoms includ irritability, muscular tension, inabilit to concentrat and a variety of physical reactions, such as headches adn accelerated heart rate. The term "stress" was first used by the endocrinologist Hans Selye in the 1930s to identify physiological respones in laboratory animals. He latr broadened and popularized the concep to include the perceptions and responses of humas trying to adapt to the challenges of everyday life. In Selye's terminology, "stress" refers to the reacton of the organsm, and "stressor" to the perceivd threat. Stress in certain circumstances may be experience positively. Eustrss, for example, can be an adaptive response promotingthe activation of internal resources to meet challenges and achieve goals. The ter is commonly used by laypersons in a metaphorical rather than literal or biological sense, as a catch-all for any perceived dfficulties in life. It also became a euphemism, a way of referring to problems and eliciting sympathy without being explicitly confessinal, just "stressed out". It covers a huge rank of phenomena from mild irritation to the kind of severe problems that might reslt in a real breakdown of health. In popular usage almost any event or situation between these extremes could be described as stressful.