remember :
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Remember :. A pathogen is a micro-organism that has the potential to cause disease. An infection is the invasion and multiplication of pathogenic microbes in an individual or population. Disease is when the infection causes damage to the individual’s vital functions or systems. - PowerPoint PPT PresentationTRANSCRIPT
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Remember:• A pathogen is a micro-organism that has the potential to
cause disease.• An infection is the invasion and multiplication of
pathogenic microbes in an individual or population.• Disease is when the infection causes damage to the
individual’s vital functions or systems.• An infection does not always result in disease!
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To make us ill microbes must:• reach their target site in the body• attach to the target site they are trying to infect • multiply rapidly• obtain their nutrients from the host• avoid and survive attack by the immune system
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Infection enters through:1. Natural openings in your body
• Eyes – hand to eye in tear duct to mucus• Mouth – attaches to teeth swallow kills most• Nose – infect mucus membranes
2. Directly infect your skin3. Take advantage of breaks in skin4. Bug bites5. Animal bites6. Penetrate skin
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Infection enters through:1. Natural openings in your body2. Directly infect your skin
• Bacteria - Staphylococci, coryneforms• Fungi - athlete’s foot, ringworm• Viruses - wart viruses live in dead skin cells
3. Take advantage of breaks in skin4. Bug bites5. Animal bites6. Penetrate skin
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1. Natural openings in your body2. Take advantage of breaks in skin
• Cuts• Catheters• Burns
3. Bug bites4. Animal bites5. Penetrate skin
Infection enters through:
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1. Natural openings in your body2. Directly infect your skin:3. Take advantage of breaks in skin4. Bug bites
• Bacteria• Parasites• Viruses
5. Animal bites6. Penetrate skin
Infection enters through:
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1. Natural openings in your body2. Directly infect your skin:3. Take advantage of breaks in skin4. Bug bites5. Animal bites
• Rabies6. Penetrate skin
Infection enters through:
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1. Natural openings in your body2. Directly infect your skin:3. Take advantage of breaks in skin4. Bug bites5. Animal bites6. Penetrate skin
• Swimmers itch – larval worms in water• Hook worm – larval worms in soil
Infection enters through:
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Aids virus budding from a white blood cell.
Reproduction•Virus - uses host
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The Defenders1. First line of defence
– Skin– Muscus membranes
2. Second line of defence3. Third line of defence
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The Defenders1. First line of defence2. Second line of defence
– White blood cells3. Third line of defence
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The Defenders1. First line of defence2. Second line of defence3. Third line of defence
– Immune response, antibody creates antigens which engulf and digest the invader
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Questions1. What types of invaders cause infection in
humans? Give an example of each type2. Why are viruses not considered to be living
things?3. In your own words, explain what disease is.4. Identify two ways in which white blood cells
protect the body from diseases.
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