The reaction to being startled and the increase in blood pressure and other physiological responses is known as

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The fight-or-flight response is the immediate physiological reaction to a perceived threat or danger, resulting in increased heart rate, blood pressure, and other responses to prepare the body for action. This response can be triggered by a variety of stimuli, including sudden loud noises or unexpected events that startle the individual.

The Reaction to Being Startled and the Increase in Blood