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Cortisol- the major glucocorticoid produced in humans, which is commonly known as the stress hormone 9. Hans Selye- proposed a three-stage model to describe the changes in physiology that occurs during exposure to severe stressors.
What is the fight or flight response? The flight or fight response, also called the acute stress response was first described by Walter Cannon in the 1920s as a theory that animals react to threats with a general discharge of the sympathetic nervous system.