Walter Cannon observed that a variety of stressors trigger

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Walter Cannon's concept of the fight-or-flight response describes a series of physiological changes that occur in response to stressors. These changes include increased heart rate, increased blood pressure, and the release of adrenaline and other stress hormones. These changes prepare the body for action in response to a perceived threat, allowing the individual to either fight the threat or flee from it.

Walter Cannon Observed That a Variety of Stressors Trigger