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Defense physiology is a term used to refer to the symphony of body function (physiology) changes which occur in response to a stress or threat. When the body executes the “fight-or-flight" reaction or stress response, the nervous system initiates, coordinates and directs specific changes in how the body is functioning (physiology), preparing the body to deal with the threat. (See also General Adaptation Syndrome.) ==Definitions== stress : As it pertains to the term ''defense physiology'', the term ''stress'' refers to a ''perceived threat'' to the continued functioning of the body / life according to its current state. threat : What constitutes a ''threat'' as it pertains to ''defense physiology''? A ''threat'' may be consciously recognized or not. A physical event (a loud noise or car collision), a chemical or a biological agent which alters (or has the possibility to alter) body function (physiology) away from optimum or healthy functioning (or away from its current state of functioning) may be perceived as a ''threat'' (also called a stressor). Life circumstances, though posing no immediate physical danger, could be perceived as a threat. Anything that could change the continuing of the person’s life as they are currently experiencing it could be perceived as a ''threat''. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Defense physiology」の詳細全文を読む スポンサード リンク
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