What is the Fight or Flight response? :
What is the Fight or Flight response? Fight or flight is the body’s response to threat or danger. Your body is faced with the decision to fight or run away from the situation. During this time your body releases hormones, giving our body a burst of energy.
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Fight Flight
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A part of the brainstem called the hypothalamus sends a nerve message to your adrenal glands and hormones like adrenaline and cortical are released into the bloodstream, where they cause the dramatic changes described above.
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Increased levels of adrenaline increase heart rate and blood flow, which in turn brings extra oxygen and glucose to the muscles.
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Changes in hormones prepare a person to both stay and deal with a stressor or to take flight.
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The body will slow down systems which are not vital for responding to the stressor, which is why a person in a fight or flight situation may have a dry mouth and a nervous or upset stomach
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Increased levels of adrenaline increase heart rate and blood flow, which in turn brings extra oxygen and glucose to the muscles
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A third alternative response which often comes before fight or flight is freezing. This is often used by prey as they seek not to be noticed by predators.
Humans also will pause at signs of danger. By freezing, you also cut down on noise and visual change and so may hear or see things around you more clearly.
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http://olin.msu.edu/thefightorflightresponsetostress.php
http://www.brainskills.co.uk/FightOrFlight.html
http://stress.about.com/od/stressmanagementglossary/g/FightorFlight.htm