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Immunity
Antigens, Pathogens, Lines of Defence
| Question | Answer |
|---|---|
| Define Immunity | A reaction that occurs in animals and humans in response to an infection |
| Define the Immune System | It assists the body to resist infection and disease through specialized cells |
| What is it meant by "self" and "Non self" | ‘self’ – material made by the body it inhabits ‘non-self’- materials, including cells that are not made by the body it inhabits. |
| Antigens | Are compounds usually made of protein and carbohydrates, they can be ‘self’ or ‘non-self’. Can trigger the immune system to respond. Usually located on the surface. |
| AntiBodies | Are proteins produced by lymphocytes in response to non-self Antigens. They react specifically with the Antigens that trigger their production. |
| Pathogens | Are organisms that are able to cause a disease in a host. Antigens on the surface of the Pathogen will trigger the immune system to respond.The Antibody will react with the Antigen by combining with it and disabling it |
| Nonspecific Immunity | Same reaction to all infections, No ‘memory’ of prior infections. Same response level for each infection of the same organism. |
| Specific Immunity | Specific reactions to each infection, ‘Memory’ of prior infections, Much greater response level on a second infection on the same organism. |
| What is the general purpose of the first line of defence? | To stop the infection or micro- organism by attempting to stop them from entering the body. |
| First Line of Defence | Skin, Mucous membranes, Natural secretions, Natural flora. |
Created by:
OWilly29
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