Fight or Flight response

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  • Fight or flight
    • The nervous system and endocrine system work together, e.g. During a stressful event
    • When a stressor is perceived, the hypothalamustriggers activity in the sympathetic branch
      • This changes the autonomic from its normal resting state (parasympathetic state) to the psysiologically aroused sympathetic state
    • The stress hormone adrenaline is released from the adrenal medulla into the bloodstream
      • This triggers physiological changes in the body (e.g. Increased heart rate)
        • This creates the physiologicalarousal necessary for the fight or flight response
          • All this happens in an instant as soon as the threat is detected and is an automatic reaction in the body
            • This changes the autonomic from its normal resting state (parasympathetic state) to the psysiologically aroused sympathetic state
            • Once the threat has passed, the parasympathetic nervous system returns the body to its resting state
              • The parasympathetic branch of the ANS works in opposition to the sympathetic nervous system
                • It's actions are antagonistic to the sympathetic system

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