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  • Created by: Amber
  • Created on: 13-12-12 12:01
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  • Pathogens
    • Enter
      • Cuts
      • Digestive system - food/drink
      • Respiratory system - inhaled
      • Mucosal surfaces - eyes, nose and mouth
    • Barriers
      • Stomach acid - most killed but some survive and pass into the intestines where they invade cells of the gut wall and casue disease
      • Skin - physical barrier, blood clots prevent entry
      • Gut and skin flora - Intestines and skin are naturally covered in billions of microorganisms (flora). They compete with pathogens for nutrients and space = limits no. of pathogens
      • Lysozyme - mucosal surfaces produce secretions containing enzymes (lysozymes) which kill bacteria by destroying their cell walls
    • Antigens
      • When a pathagen invade the body, the antigens on its cell surface are recognised as foreign, this activates cells in immune system.




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