Fight or Flight

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  • Fight or Flight
    • Physiological Changes
      • pupils dilate
      • heart rate and blood pressure increase
      • arterioles to the digestive system and skin are constricted
      • blood glucose levels increase
      • arterioles to the muscles and liver are dialated
      • metabolic rate increases
      • erector pili muscles in the skin contract, making hair stand up
      • ventilation rate and depth increase
      • sweat production increase
    • Response to a stimuli is mainly the result of brain activity
      • Assesses the most appropriate response
    • Brain regulates a number of endocrine responses through the action of the hypothalamus
      • hypothalamus controls the pituitary gland
      • Response to a stimuli is mainly the result of brain activity
        • Assesses the most appropriate response
    • Coordination of the physiological changes
      • cerebral understanding of a threat activates the hypothalamus
        • stimulates increased activity in the sympathetic nervous system
          • triggers release of adrenaline from the adrenal medulla into the blood
            • hypothalamus also releases corticotropin-releasing factor (CRF) into the pituitary gland
              • stimulates the release of the hormone adreno-corticotopic hormone (ACTH) from (anterior) pituitary gland
                • stimulates the release of a number of different (corticosteroid) hormones from the adrenal cortex
                  • help body to resist stressors
                    • combined effects of increased sympathetic nervous system activity and the release of adrenaline and other hormones into blood are responsible for the physiological changes of the flight or flight resposne
                    • Stressor: stimulus that causes the stress response
  • Timing of the fight or flight response
    • period of heightened awareness
    • Fight or Flight
      • Physiological Changes
        • pupils dilate
        • heart rate and blood pressure increase
        • arterioles to the digestive system and skin are constricted
        • blood glucose levels increase
        • arterioles to the muscles and liver are dialated
        • metabolic rate increases
        • erector pili muscles in the skin contract, making hair stand up
        • ventilation rate and depth increase
        • sweat production increase
      • Brain regulates a number of endocrine responses through the action of the hypothalamus
        • hypothalamus controls the pituitary gland
      • Coordination of the physiological changes
        • cerebral understanding of a threat activates the hypothalamus
          • stimulates increased activity in the sympathetic nervous system
            • triggers release of adrenaline from the adrenal medulla into the blood
              • hypothalamus also releases corticotropin-releasing factor (CRF) into the pituitary gland
                • stimulates the release of the hormone adreno-corticotopic hormone (ACTH) from (anterior) pituitary gland
                  • stimulates the release of a number of different (corticosteroid) hormones from the adrenal cortex
                    • help body to resist stressors
                      • combined effects of increased sympathetic nervous system activity and the release of adrenaline and other hormones into blood are responsible for the physiological changes of the flight or flight resposne
                      • Stressor: stimulus that causes the stress response
  • Hypothalamus
    • Activates the sympathetic nervous system
      • impulses activate glands and smooth muscles
      • activates adrenal medulla
        • releases noradrenaline
          • bloodstream
            • neural activity combines with hormones in the bloodstream to constitute fight-or-flight response
              • impulses activate glands and smooth muscles
        • releases adrenaline
          • bloodstream
            • neural activity combines with hormones in the bloodstream to constitute fight-or-flight response
      • stimulates anterior pituitary gland to release CRF
        • pituitary gland secretes hormone ACTH
          • ACTH arrives at adrenal cortex and releases approximately 30 hormones

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