biology - fighting disease

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  • Created by: Kirz123
  • Created on: 26-03-12 12:38

PATHOGENS AND DISEASE

what are pathogens?

Pathogens are micoorganisms that enter the body anc cause disease.

how many types of pathogens are there?

2 types. bacteria and viruses.

What are bacteria?

bacteria are very small living cells which  make you feel really ill by doing 2 things. damaging your cells and producing toxins.

bateria  reproduce very rapidly.

Viruses however, are not cells. they are even smaller.

they make copies of themselves by invading your cells and using the cell's machinery to make copies of themselves.

the cell usually bursts realsing all the new viruses.

this cell damage makes you feel ill.

The body has a very good defence system.

skin, hairs and mucus in the respiratory tract stopping many pathogens getting inside your body.

when you cut…

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