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Biology and disease Unit 1 summary
Micro organism: a term for a single celled organism that is too small to be seen
without a microscope. (Includes viruses & bacteria) ­ Many of these micro
organisms live in our body and cause us no harm (some are beneficial)

A Pathogen:…

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The digestive system ­ food & water may carry pathogens into
stomach/intestines via the mouth (cholera & typhoid)

The body has developed some natural defences to prevent entry of

Mucous layer cover gas exchange surfaces, ­ thick/sticky (hard to penetrate).
Production of enzymes that can break down the pathogens.…


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