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Key Points

  • Epinephrine
    • Norepinephrine has the same endocrine function as Epinephrine
    • Origin: Adrenal Medulla
    • Type: Tyrosine derivative
      • Water-soluble (hydrophilic)
        • Cannot diffuse across cell membrane
        • Uses GPCR pathway
          • Uses a secondary messenger system because Epinephrine acts like a hydrophilic protein hormone
    • Trigger: Stress
    • Effects:
      • Increases blood flow to skeletal muscles
      • Constricts blood vessels/reduces blood flow to most organs
      • Promotes glycogenolysis in liver
      • All actions by epinephrine are designed to promote the fight or flight response