A rapidly occurring chain of internal physical reactions that prepare people to respond to an immediate threat is called the fight-or-flight response.

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The fight-or-flight response is a well-known physiological response to stress or danger that activates the sympathetic nervous system to prepare the body for an immediate physical response. It is called the fight-or-flight response because it prepares the body to either fight the threat or run away from it. The response involves a series of internal physical reactions, such as increased heart rate, rapid breathing, and sweating, that help to improve physical performance and alertness in stressful situations.

A Rapidly Occurring Chain of Internal Physical Reactions That Prepare