1.1 Pathogens

Georgia Knight
Mind Map by Georgia Knight, updated more than 1 year ago
Georgia Knight
Created by Georgia Knight almost 6 years ago


AQA A-Level Biology Unit 1.1

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1.1 Pathogens
1 Micro-organisms that cause disease, e.g.viruses and bacteria
1.1 A microorganism is a single celled organism too small to be seen without a microscope
1.2 Disease is a description of certain symptoms - physical or mental. It suggests a malfunction of body or mind which has an adverse affect on good health
1.3 For a microorganism to be considered a pathogen it must:
1.3.1 gain entry to the host
1.3.2 colonise the tissues of the host
1.3.3 resist the defences of the host
1.3.4 cause damage to the host tissues
2 How pathogens enter the body:
2.1 the gas exchange system
2.2 The digestive system
3 The Body's defences against pathogens:
3.1 mucous layer that covers exchange surfaces and forms a sticky, hard to penetrate barrier
3.2 the production of enzymes that break down pathogens
3.3 production of stomach acid that kills microorganisms
4 How pathogens cause disease
4.1 By damaging host tissues
4.2 by producing toxins
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