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  • Created by: Rachel98
  • Created on: 18-05-15 14:32
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  • Disease
    • Pathogens cause infectious disease.
      • A pathogen is any organism that causes disease
      • Pathogens include microorganisms and some larger organisms, such as tapeworms
      • Pathogenic microorganisms include some bacteria, some fungi and all viruses
    • Pathogens penetrate organisms interfaces with the environment
      • Gas-Exchange System. if pathogens make it into the alveoli then the are able to cause damage
      • Skin- Pathogens may be able to penetrate through breaks in the skin before a clot form over a wound. If the pathogen enters through the skin it will then enter the bloodstream.
      • Digestive System- if a pathogen survives the HCl in the stomach it can then pass into the instestine where it may pass into the cells of the gut and cause disease.
    • Pathogens cause disease in two ways.
      • 1) They release harmful toxins which damage specific cells and proteins within the body.
      • 2) Direct damage to cells
        • Rupturing cells to release their contents eg. proteins
        • Breaking down nutrients inside the cell for the pathogen's own use. The cell will die
        • Replicating inside the cell and eventually causing the cell to burst
    • Lifestyle can affect your risk of developing some diseases
      • Coronary heat disease ( CHD)
        • Poor diet- A diet high in saturated fat and salts can increase your risk
        • Smoking
          • Cancer
            • Overexposure to UV rays
              • From the sun
              • From sunbeds
        • Excessive alcohol consumption
          • Cancer
            • Overexposure to UV rays
              • From the sun
              • From sunbeds
        • Lack of exercise
        • Anything which increases blood pressure


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