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1. CAUSES OF DISEASE
1.1 PATHOGENS
Microorganism ­ single-celled organism (too small to be seen with a microscope)

Microorganisms live in our bodies often benefits us but sometimes causes harm

Microorganisms that cause disease Pathogens

Pathogenic microorganisms include:

Some bacteria
Some Fungi
All Viruses



Disease Malfunction of the body or…

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Gas exchange system

Pathogens enter body that cause influenza, tuberculosis and bronchitis

Digestive system

Food and water enters the body through the mouth to the stomach

Cholera, typhoid and dysentery enter the body this way


Preventing entry:
o Mucous layer that covers exchange systems ­ forms sticky barrier
o Production…

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o Main cause of mouth, throat and lung cancer
Excessive exposure to sunlight
o Skin cancer
o Using sunbeds and sunbathing without sunscreen increases risk
Excessive alcohol intake
o Increase risk of many cancers esp. liver cancer


How quickly pathogen causes damage onset of symptoms how rapidly the pathogen
divides…

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