The Body's Stress Response Mechanisms

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  • Created by: Rachael
  • Created on: 14-12-12 20:22
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  • The Body's Stress Response Mechanisms
    • Hypothalamic Pituitary Adrenal (HPA) System
      • Chemical-based system and is not as fast as symathomedullary pathway
      • 1) Stressor sensed in hypothalamus
        • 2) Signals pituitary gland to secrete ACTH
          • 3) Adrenal cortex detects ACTH and releases corticosteroids
            • This helps blood to clot and influences sugar and salt levels in the blood
    • The Sympathomedullary pathway
      • Uses electricity and is very fast
      • 1) Hypothalamus activates sympathetic branch of the ANS
        • 2) The sympathetic branch sends a signal to the adrenal medulla
          • 3) The adrenal medulla releases adrenaline and noradrenaline
            • 4) These contribute to the stress response e.g increasing blood pressure and heart rate


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