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Communicable Diseases (Immune system + Non-specific defences (Plant…
Communicable Diseases
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Diseases + Pathogens
Pathogen - organism that causes a diseaseCommunicable Disease - disease that can spread between organisms or species Bacterium
- Tuberculosis
- Ring rot
- Bacterial Meningitis
Viruses
Fungi
- Ring worm
- Black sigatoka
- Athletes foot
Protoctists
- Malaria
- Tomato/Potato late blight
Pathogens Mode of actionDamaging host tissues directly
- Viruses take over cell metabolism and inject their genetic material into the host cell's DNA-uses the host cell to make more copies of itself - burst out of the cell destroying - spread to infect other cells
- Some Protoctists digest the cell contents as they reproduce and then burst out the cell - destroying it
- Some fungi digest living cells - destroy cells
Producing toxins
- Some bacteria prod toxins damage or poison the hosts cells - some prod toxins - break down cell membrane others prod toxins that damage or inactivate enzymes or interfere with the cells genetic material so cell cannot divide
- Some fungi - prod toxins
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