Biology- Unit 1- Causes of Disease

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  • Created by: FireDwarf
  • Created on: 27-10-13 18:31
What is a microorganisim?
Single-celled organisim thats too small to see without a microscope.
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What is a pathogen?
A microbe which causes disease
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What is disease?
Malfunctioning of the body or mind which has an adverse effect on good health.
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What must of a microbe do to be considered a pathogen?
Gain entry to host, colonise tissue of the host, resist defences of the host, cause damage to the host tissue.
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Pathogens include?
Bacteria, viruses and fungi.
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Diffrence between infection and disease?
Infection- Colonise tissues, disease- reconsiable symptoms.
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How do microbes get into the body?
Penetrating an organisims interfaces with the enviroment. An interface is a boundary between two systems (internal and enviroment).
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Examples of interfaces?
Skin breakes, gas-exchange systems, digestive system.
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why are these places easy access?
They are thin,moist, large surface area, good blood supply.
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How do these entry points defend agianst pathogens?
Mucus layer covers exchange surfaces- difficult to penatrate, enzymes break down pathogens, stomach acid.
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How do pathogens cause disease?
Damaging host tissue (breaking down membranes of the cells), Producing toxins
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Example of how a toxin does it?
eg: causes massive water loss from the intestines
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What effects the speed of the pathogens damage?
Symptoms will onset at a faster rate if the speed at which the pathogen divdies is fast.
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Card 2


What is a pathogen?


A microbe which causes disease

Card 3


What is disease?


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Card 4


What must of a microbe do to be considered a pathogen?


Preview of the front of card 4

Card 5


Pathogens include?


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