The different types
There are three types of white blood cells
Phagocytes - they are non specific
T-lymphocytes/ T-cells - part of the cell mediated responce
B-lymphocytes/ B-cells - part of the humoural responce
The stages of phagocytosis
1) Chemoattractants attract the phagocyte to the pathogen.
2) The phagocyte engulfs the pathogen.
3) The phagocyte traps the pathogen in a vesicle.
4) Lysosomes fuse with the vesicle.
5) The lysosome puts lysosomial enzymes on the pathogen.
6) The pathogen is digested.
This is the cell mediated responce:
1) The infected cell displayes the pathogens antibodies on it's cell.
2) A t-cell with a receptor that is complementary to the antibody binds.
3) The t-cell then divides by mitosis.
These t-cells then do these things
- Make a protien which makes holes in the infected cell's cell surface membrane
- Make memory cells
- Stimulate the production of b-cells.
This is part of the humoral responce
1) A b-cell with a complementary antigen to the pathogens antibody bind to form an antigen-antibody complex
2) B-cells then divide by mitosis
3) They then become plasma cells which release antibodies that destroy pathigens + their toxins