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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.
Examples of physiological adaptation are tanning of skin when exposed to sun over long periods, the formation of callouses on hands in response to repeated contact or pressure, and the ability of certain organisms to absorb nutrients under low oxygen tensions.