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Hans Selye was the psychologist that is credited with proposing the general adaptation syndrome.
What happens physiologically and psychologically during the General Adaptation Syndrome?
Read more: What_happens_physiologically_and_psychologically_during_the_General_Adaptation_Syndrome
General adaptation syndrome is used to describe how someone's body short and long term reaction to stress. This is to see how someone is able to handle their stress.
How many stages?
sympathetic and parasympathetic