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Fight-or-flight Fight-or-flight response A term used to describe the brain's most basic reaction to fear. The human brain's response to danger is the 'fight or flight' or 'stress' response. The hormone adrenaline is released and blood is sent to the arms and legs so that the endangered person can escape the threat by 'flight' or confront it through 'fight'. Blood vessels in the digestive system close as blood is redirected, the heart pace quickens, blood pressure rises, the brain focuses on the danger but cannot concentrate fully on more complex thought. This stress response is very useful in moments of actual physical danger but the 'flight or fight' response can be brought about by any sort of stress - long term stress responses can lead to ill health, lack of concentration, fatigue, etc.
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