Phagocytosis
- Created by: Chris
- Created on: 31-12-12 11:10
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Phagocytosis:
- The invading pathogen releases chemicals which act as attractants for a white blood cell causing it to move towards the pathogen
- The white blood cell then attaches to the surface of the pathogen and engulfs it to form a vessicle
- Lysosomes then move towards the vessicle and fuse with it
- Enzymes within the lysosomes break down the pathogen and destroy it
- Waste products from the pathogen are absorbed into the cytoplasm
Cell mediated immunity:
T lymphocytes respond to an organisms own cells that have been invaded by non self material for example a virus or cancer cell.
- Pathogens invade body cells or are taken in by phogocytes
- The phagocyte places antigens from the pathogen on its cell surface membrane
- receptors on certain T helper cells fit exactly onto these antigens
- This activates other T cells to divide rapidly by mitosis…
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