Pathogens 0.0 / 5 ? BiologyHealth, illness and diseaseASAQA Created by: meganbradfield1Created on: 23-03-16 16:59 What is a pathogen? A bacteria, virus, or fungi which is harmful and causes disease. 1 of 9 What must a pathogen do in order to be considered as one? Gain entry to the host; colonise tissues; resist defences; cause damage to tissues. 2 of 9 When does infection occur? When a pathogen gains entry to the host and colonises its tissue. 3 of 9 When does disease occur? When an infection leads to symptoms. 4 of 9 What is transmission? When a pathogen is transferred from one person to another. 5 of 9 What 2 interfaces are common points of entry for pathogens? The gas exchange system & the digestive system. 6 of 9 Name some natural defences the body produces towards the entry of pathogens? Mucous layer covering exchange surfaces (thick barrier - hard to penetrate); enzymes (to break down); stomach acid. 7 of 9 Name 2 ways pathogens cause disease. Damaging host tissues & Producing toxins. 8 of 9 What is related to how quickly a pathogen causes damage? How rapidly it divides. 9 of 9
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