2455387
Beschreibung
Karteikarten von Charlotte Hewson, aktualisiert more than 1 year ago
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Erstellt von Charlotte Hewson
vor mehr als 9 Jahre
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| Frage | Antworten |
| what is a pathogen? | a micro-organism that causes disease |
| what are the 4 things a pathogen must do? | -gain entry to host -colonise tissue of host -resist host defences -damage host tissues |
| when does infection occur? | when the pathogen gets in and colonises the tissue |
| when does disease occur? | when an infection leads to recognisable symptoms |
| what is it called when a pathogen is transferred from one individual to another? | transmission |
| how do pathogens get into the body? | by penetrating one of the organisms interfaces with the environment |
| what are two common points of entry for a pathogen? | -the gas exchange system -the digestive system |
| what can be caused by pathogens entering the gas exchange system? | influenza, tuberculosis and bronchitis |
| what diseases can be caused by pathogens entering the digestive system? | cholera, typhoid and dysentery |
| what 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 |
| what are the two main ways a pathogen affects the body? | -damages host tissues -produces toxins |
| what is an example of a pathogen damaging host tissue? | many pathogens break down the membrane of host cells |
| what determines how quickly a pathogen causes damage? | how rapidly the pathogen divides |
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