Causes Of Disease

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  • Created by: JazzB
  • Created on: 28-01-14 18:40
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  • Causes Of Disease
    • Lifestyle and Health
      • What is risk?
        • The probability that a hazardous event will occur
          • OR
            • The consequence of that hazardous event
  • To be considered a pathogen a micro-organism must:
    • Colonise host's tissues
    • Resist host's defences
    • Damage host's tissues
    • Gain entry to host body
      • If a pathogen colonises tissue infection occurs
        • When a pathogen (and therefore disease) is passed from one host body to another it is called transmission
        • Pathogens
          • Causes Of Disease
            • Lifestyle and Health
              • What is risk?
                • The probability that a hazardous event will occur
                  • OR
                    • The consequence of that hazardous event
          • To be considered a pathogen a micro-organism must:
            • Colonise host's tissues
            • Resist host's defences
            • Damage host's tissues
            • Gain entry to host body
              • If a pathogen colonises tissue infection occurs
                • When a pathogen (and therefore disease) is passed from one host body to another it is called transmission
                • Pathogens
                  • Common points of pathogen entry include the gas-exchange system and the digestive system
                  • difficult-to-penetrate mucous barrier
                    • enzymes which break down pathogens
                      • The body's natural defences include:
                        • stomach acid, with a pH of 2
          • Common points of pathogen entry include the gas-exchange system and the digestive system
          • difficult-to-penetrate mucous barrier
            • enzymes which break down pathogens
              • The body's natural defences include:
                • stomach acid, with a pH of 2
  • Disease is when infection leads to recognisable symptoms
    • Measured as a percentage; 0 % = no harm will occur, 100% = harm will certainly occur
      • Risk: a measure of the probability that damage to health will occur as the result of a given hazard
        • Smoking (both active and passive)
          • Things that affect risk of cancer:
            • Diet
            • Obesity
            • Activity
            • Exposure to sunlight

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