Pathogens and Lifestyle

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What is a pathogen?
A microorganism that can cause disease
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For a microorganism to be considered a pathogen it must?
Gain entry to the host, Colonise the hosts tissue, Resist defences of the host and Cause damage to the hosts tissue
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How does disease occur?
When an infection leads to recognisable symptoms in the host
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How do pathogens enter the body?
By penetrating one of the bodys interfacs with the environment
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How is the skin effective as a barrier against infection?
It has thick, continuous layers
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How can pathogens enter the skin?
If it is broken by a cut or insect bite
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How have interfaces evolved for material exchange?
They have become thin, moist, large surface area and supplied with blood vessels
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Which pathogens enter through the gas exchange system?
Influenza, tuberculosis and bronchitis
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How do pathogens get into the digestive system?
Food and water carry pathogens into the stomach via the mouth
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How does the body prevent the entry of pathogens?
It has a mucus layer, produces enzymes and produces stomach acid
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How do pathogens cause disease?
By damaging the hosts tissue and by producing toxins.
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What is a risk?
A measure of the probability that damage to health will occur as a result of a given hazard
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How is a risk measured?
As a percentage from 0% no harm will occur, to 100% harm will occur
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What factors affect the risk of contracting cancer and coronary heart disease?
Smoking, diet, obesity, physical activity
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Other cards in this set

Card 2

Front

For a microorganism to be considered a pathogen it must?

Back

Gain entry to the host, Colonise the hosts tissue, Resist defences of the host and Cause damage to the hosts tissue

Card 3

Front

How does disease occur?

Back

Preview of the front of card 3

Card 4

Front

How do pathogens enter the body?

Back

Preview of the front of card 4

Card 5

Front

How is the skin effective as a barrier against infection?

Back

Preview of the front of card 5
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