Biology 6.1 Defence Mechanisms

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  • Created by: Anna
  • Created on: 30-04-13 22:51

Any disease = interaction between pathogen and body's various defence mechanisms.

Having overwhelmed a pathogen, the body's defences are better prepared for a second infection from same pathogen, can repel it before it causes harm = immunity.

Those in ill health, the young and the elderly are usually more vulnerable.

Defence Mechanisms

Two main types:

  • Non-specific mechanisms = don't distinguish between one type of pathogen and another, respond to all in the same way and act immediately. Take two forms: a) Barrier to entry of pathogens e.g. skin or b) phagocytosis.
  • Specific mechanisms = distinguish between different pathogens, responses are less rapid but provide long-lasting immunity, involved type of white blood cell called lymphocyte, takes two forms: a…


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