Hormones

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  • Created by: Hannah
  • Created on: 03-08-16 15:50
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  • comunication systems in animals
    • Hormones
      • 3 main types of Hormaons
        • proteins (insuline,  glicogen)
        • Amines (adrenaline)
        • Steroids (cortisol, oestrogen + progesterone)
      • Detect changes- generate and appropriate respose
      • Regulate energy use, metabolism and growth
      • maintain homeostasis
      • Are secured by endocrine
      • reach all parts of the body
      • minute quantities produce significant effects
      • one hormones can have different effects
      • lipid - soluble hormones
        • passes though the target cell membrane
        • bind to an intracellular receptor
        • hormone receptor complex binds to DNA
      • water soluble hormones
        • binds to recptors
        • receptors pprotein
        • series of relay molecules
        • cell response occurs
      • control of glucose
        • insulin + glucagon are antagonistic
        • negative feedback
        • in the pancreas
          • alpha cells - release glucagen
          • beta cells - release insulin
        • increase glucose, release of insulin
        • release into the blood
      • steroid hormones regulate gene expression
        • receptors in cytosal
        • hormone receptor complex
        • conformational change
        • nuclear transcription
        • activates gene transcription
        • production of protiens
      • mechanisms controlling the release of homones
        • specific metabolite in the blood e.g. glucose
        • TSH, thyroid stimulating hormone
        • stimulation of neurons
      • thyroid secrete T3 + T4 which regulates -
        • heart rate
        • muscle tone
        • bionergetics
        • Digestive and reproductive function
    • External
      • Changes in temp
      • response to danger
    • internal
      • changes in blood glucose levels
      • changes in osmotic pressure

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