Pathogens
- Created by: Ellie Rivers
- Created on: 18-03-13 19:32
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- Pathogens
- Pathogens include BACTERIA, FUNGI, and VIRUSES
- Microorganisms must:
- 1. gain entry to the host
- 2. colonise the tissue of the host
- 3. resist the defences of the host
- 4. cause damage to the host tissues
- if a pathogen gets into the host it causes an infection
- disease occurs when the infection leads to recognisable symptoms
- Transmission: pathogen being transferred from one to another
- Entering the body
- pathogens penetrate the organisms interfaces
- interfaces include the SKIN, GAS EXCHANGE SYSTEMS and DIGESTIVE SYSTEM
- the GAS EXCHANGE SYSTEM
- Mouth and nose
- covered in a mucus layer that is difficult to penetrate
- DIGESTIVE SYSTEM
- Food and water may carry pathogens
- produces enzymes to break down pathogens
- produces stomach acid to kill microorganisms
- pathogens penetrate the organisms interfaces
- Causes
- damaging host tissues
- prevents tissues from functioning properly
- break down the membranes of the cells
- producing toxins
- produce toxins which affect the host cell
- damaging host tissues
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