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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.
The resulting change in ion permeability triggers a depolarization of the plasma membrane called an end plate potential. The end plate potential triggers a series of events that results in the contraction of a muscle cell. Describe the three phases of a muscle twitch.