Biology AS Unit 1 AQA - Causes of Disease 4.0 / 5 based on 2 ratings ? BiologyHealth, illness and diseaseASAQA Created by: CharlotteCreated on: 08-01-13 12:36 What is a pathogen? A disease causing micro-organism. 1 of 6 For a micro-organism to be considered a pathogen it must... Gain entry to the host, colonise the tissues of the host, resist the defences of the host and cause damage to the host tissues. 2 of 6 How do pathogens cause disease? By damaging host tissues and by producing toxins. 3 of 6 When a pathogen is transferred from one individual to the other it is is called... Transmission. 4 of 6 What are the body's natural defences to pathogens? Enzymes, stomach acid and a mucus layer covering exchange surfaces. 5 of 6 What is a risk? A measure of the probability that damage to health will occur as a result of a given hazard. 6 of 6
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