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AQA Biology 1.1 pathogens
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- 1what is a pathogen?a micro-organism that causes disease
- 2what are the 4 things a pathogen must do?-gain entry to host
-colonise tissue of host
-resist host defences
-damage host tissues - 3when does infection occur?when the pathogen gets in and colonises the tissue
- 4when does disease occur?when an infection leads to recognisable symptoms
- 5what is it called when a pathogen is transferred from one individual to another?transmission
- 6how do pathogens get into the body?by penetrating one of the organisms interfaces with the environment
- 7what are two common points of entry for a pathogen?-the gas exchange system
-the digestive system - 8what can be caused by pathogens entering the gas exchange system?influenza, tuberculosis and bronchitis
- 9what diseases can be caused by pathogens entering the digestive system?cholera, typhoid and dysentery
- 10what are three of the bodies natural defences?-mucous layer forms thick, sticky layer that's difficult to penetrate on exchange surfaces
-produce enzymes to break down pathogens
-produce stomach acid which kills micro-organisms - 11what are the two main ways a pathogen affects the body?-damages host tissues
-produces toxins - 12what is an example of a pathogen damaging host tissue?many pathogens break down the membrane of host cells
- 13what determines how quickly a pathogen causes damage?how rapidly the pathogen divides
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- AS - Level AS Biology Fichas sobre AQA Biology 1.1 pathogens, creado por Charlotte Hewson el 08/04/2015.
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- Charlotte Hewson
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