Causes Of Disease

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Causes Of Disease


  • Microorganisms that cause disease.
  • Penetrate organism's interfaces with the environment.
  • Damage host tissues-break down membranes of host cells.
  • Producing toxins-leads to excessive water loss from the lining of the intestine.


  • A pathogen gets into the host and colonises its tissue.


  • A malfunction of body or mind which has an adverse effect on good health.
  • Occurs when an infection leads to regonisable symptoms.


  • When a pathogen is transferred from one individual to another.


  • A surface or boundary linking two systems.
  • Gas exchange system.
  • Digestive system.

Natural Defenses

  • Mucous layer that covers exchange surfaces & forms a…


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