Disease

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  • Created by: Kate
  • Created on: 20-02-14 20:08

Pathogens

  • Organisms which cause disease 
  • Include large organisms like tape worms 
  • Also micro organisms some bacteria, some fungi and all viruses
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Organism interface-Gas exchange system

GAS-EXCHANGE SYSTEM 

  • Air which contains pathogens is breated in 
  • Most sre trapped in the mucus lining in the epithelium 
  • Cillia waft the mucus up to the mouth 
  • Pathogens which reach the alveoli invade cells and cause damage 
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Organism interface-Skin

  • Damage to skin 
  • Pathogens enter blood stream 
  • Blood clots at the area 
  • Some get in before the clot forms 
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Organism interface-Digestive System

  • Eat or drink food that contains pathogens 
  • Most are killed by the acid in the stomach 
  • Some pass into the intestine 
  • Invade cells and the gut wall
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Production of toxins

  • Bacteria produce toxins into the body 
  • Bacterium that causes tetnus blocks the function of certian nerve cells
  • Causing muscle spasms 
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Cell damage

Physically damage host cells by:

  • Rupturing- Release nutrients (protiens) inside them 
  • Breaking down - Nutrients for own use. starves and kills the cell
  • Replicating- Inside cells, bursting them when they're released (Viruses) 
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Coronary heart Disease (CHD)

Increased by:

  • Poor diet- High sat fat or salt 
  • Smoking 
  • Lack of excersize 
  • Excessive alcohol intake 
  • All increase bp which dmage the heart and blood vessels 
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Cancer

Uncontrolled cell division, increase the risk:

  • Smoking - Mouth, throat, and lung cancer 
  • Exposure to sunlight - Increase Skin cancer (UVb radiation)
  • Alcohol intake - Liver cancer
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Cancer

Uncontrolled cell division, increase the risk:

  • Smoking - Mouth, throat, and lung cancer 
  • Exposure to sunlight - Increase Skin cancer (UVb radiation)
  • Alcohol intake - Liver cancer
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