1.1 Pathogens

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  • Pathogens
    • Micro-organisms as pathogens
      • To be considered a pathogen it must
        • Resist the defences.
        • Colonise the tissues.
        • Cause damage to the tissues.
        • Gain entry.
    • Entrance into the body
      • Prevention.
        • Enzymes that break down pathogens.
        • Mucus layer covering exchange surfaces.
        • Stomach acid that kills pathogens.
      • How?
        • Through the digestive system.
        • Through the gas exchange system.
    • How do pathogens cause disease
      • By producing toxins.
      • By damaging host tissues.


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