CIE A Level Biology复习笔记11.1.2 Antigens
Antigens, Self & Non-Self
- Every cell in the human body has?markers?that?identify?it
- Microorganisms (both pathogenic and non-pathogenic), such as bacteria and viruses, also have their own unique markers
- These markers are called?antigens?(which are macromolecules) and they allow?cell-to-cell recognition
- Antigens are found on cell surface membranes, bacterial cell walls, or the surfaces of viruses
- Some glycolipids and glycoproteins on the outer surface of cell surface membranes act as antigens
- Antigens can be either?self antigens?or?non-self antigens:
- Antigens?produced by the organism's own body cells?(those that the immune system does not recognise as foreign antigens) are known as?self antigens
- Self antigens?do not stimulate an immune response
- Antigens?not produced by the organism’s own body cells?(those that the immune system recognises as being foreign eg. the antigens found on pathogenic bacteria and viruses or if a person receives a different blood type during a transfusion) are known as?non-self antigens
- Non-self antigens?stimulate an immune response
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