Pathogen
- Created by: Sanah
- Created on: 12-03-13 09:31
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- Pathogen
- Micro-organism
- "Bacteria or virus that is too small to be seen without a microscope".
- "A disease causing micro-organism".
- How can a micro-organism be classed as a pathogen?
- 1) Gain entry in the hosts tissues.
- 2) Colonise the hosts tissues
- 3) Resist the hosts defence mechanisms.
- 4) Cause damage to the hosts tissues.
- e.g, breaks down the membrane of the hosts cell.
- 4) Cause damage to the hosts tissues.
- 3) Resist the hosts defence mechanisms.
- 2) Colonise the hosts tissues
- 1) Gain entry in the hosts tissues.
- Interface
- " A boundary that links together 2 systems", INTERNAL AND EXTERNAL ENVIROMENTOF THE BODY.
- The skin forms an effective barrier to infection, THICK CONTINUOS LAYER.
- EVOLVED INTERFACES:Digestive system & Gas exchange system
- Good supply of blood vessels and Large Surface Area.
- How do pathogens cause disease?
- 1. Damage host tissues by breaking down membrane of host cell, this prevents the host cell from functioning properly.
- 2. Produces toxins, e.g cholera bacterium...
- Micro-organism
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