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Fight or Flight Response

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Updated July 08, 2008

Definition:

An internal alarm system that causes numerous physiological changes to get one ready to fight or flee a dangerous situation.

Some of the physiological changes that occur during this process include:

  • Increased heart rate
  • Accelerated breathing
  • Constriction of blood vessels to some parts of the body and dilation of blood vessels to the muscles
  • Dilation of pupils
  • Auditory Exclusion (hearing loss)
  • Tunnel Vision (loss of peripheral vision)
  • Sweating to cool the body in response to the heat generated as one gets ready to contend with a predator
  1. About.com
  2. Health
  3. Panic Disorder
  4. Glossary
  5. Glossary: A-H
  6. Fight-or-Flight Response - Definiton of Fight-or-Flight Response

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