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  • Created by: dom
  • Created on: 11-05-15 10:42
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      • malfunction of the body which has adverse affects on good health
      • microorganism that causes disease
      • for a microorganism to be considered a pathogen it must..
        • gain entry to host, resist defences of host, colonise tissue of host and cause damage to tissue
      • bacteria, virus and fungi
      • when a pathogen is transfereed from one person to another = transmission
    • how do microorganisms get In the body?
      • penetrating one of organisms interfaces with environment
        • interface is a surface or boundary linking 2 systems
      • skin - when skin is broken - cuts/insect bites etc.
      • gas exchange system
      • digestive system
      • natural defences -
        • mucous layer that covers exchange surface to make difficult to penetrate
        • enzymes that break down pathogens
        • production of stomach acid
    • how do pathogens cause disease?
      • damaging host tissue
        • sheer number of pathogens cause damage - prevent tissue functioning properly
          • virus inhibit synthesis of dna and rna
          • some pathogens break down membrane
      • producing toxins
        • most bacteria release toxins
          • toxin - harmful substance to the body


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