Pathogens, disease and defence mechanisms
- Created by: Emma_trevs
- Created on: 19-03-14 16:55
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- Pathogens, disease and defence mechanisms.
- Pathogens cause infectious diseases.
- Pathogens are tiny microorganism, usually bacteria or viruses.
- When bacteria or viruses enter the body, they reproduce rapidly.
- They can make you feel ill by producing toxins.
- Viruses are much smaller than bacteria and reproduce inside cells. The damage to cells can also make you ill.
- They can make you feel ill by producing toxins.
- Before the discovery of bacteria and viruses, a doctor called Semmelweiss realised that infection could be passed from person to person in a hospital.
- Semmelweiss told doctors to wash their hands between treating patients, however many doctors did not take him seriously.
- The skin prevents pathogens from getting into the body.
- Pathogens can be trapped in mucus and killed in stomach acid.
- The white blood cells do 3 things to defend the body.
- They can ingest pathogens which means that they can digest and destroy them.
- The produce antibodies to help destroy certain pathogens.
- They produce antitoxins which help to counteract the toxins that pathogens produce
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