Pathogens and diseases

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  • Pathogens + diseases
    • Bacteria             fungi             virus
    • Microorganisms are single celled organisms otherwise known as pathogens which causes disease.
      • Disease= recognisable symptoms. Physical/  mental/social
      • Two ways pathogens cause harm: damage the cell-rupture, inhibit synthesis, break down of wall
        • Releasing toxins
    • Correlation= change in one variable reflects in a change in another variable
    • Interface= a boundary which connects two environments. E.g. internal and external such as skin.
      • Skin, Digestive system, gas exchange system
        • Skin- if a cut occurs, it provides access for the blood stream. However the skin prevents this by blood clots- prevents it entering blood stream
        • Digestive system- food + water may contain pathogens. HCl in stomach + enzymes break down pathogens
        • Gas exchange system- air might contain airborne pathogens.
        • Thin,  Moist,, large surface are  with blood supply= enables pathogens to enter
    • CHD:  genes, sex, age affect it. other factors:  high plood pressure, high blood cholestrol, lack of excercise/obesity, diet, alcohol
    • Cancer: genes, age. Factors that affect it: diet, smoking, sunlight, alcohol, obesity, diet
  • Bacteria             fungi             virus
  • Digestive system- food + water may contain pathogens. HCl in stomach + enzymes break down pathogens
  • Gas exchange system- air might contain airborne pathogens.

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