Humoral and cell mediated immunity
- Created by: versailee
- Created on: 03-03-20 16:24
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- Immunity
- Cell mediated immunity
- 1- Pathogens invade body cells or are taken in by phagocytosis
- 2-The phagocyte places antigens from the pathogen on its cell surface membrane
- Receptors on certain T helper cells fit exactly onto these antigens
- 3- This activates other T cells to divide rapidly by mitosis to form a genetically identical clone
- The cloned T Cells either:
- Develop into MEMORY CELLS
- Enables a rapid response to future invasions by the same pathogen
- Stimulate B Cells to divide, killing infected cells
- Stimulate phagocytes to engulf pathogens by phagocytosis
- Develop into MEMORY CELLS
- The cloned T Cells either:
- 2-The phagocyte places antigens from the pathogen on its cell surface membrane
- 1- Pathogens invade body cells or are taken in by phagocytosis
- Humoral immunity
- B cells are covered in antibodies so they are specific to certain antigens.
- 1. When a bacterium enters the bloodstream it will be ingested by a phagocyte
- 2. T Helper Cells then attach to the antigens on the B Cells thereby activating them
- 3. The B Cells are then activated to divide by mitosis to give a clone of the plasma cells
- 4. The antibodies will then attach to the antigens on the pathogen and destroy them - Primary response
- Some B Cells will develop into memory cells which respond to future infections by the same pathogen by dividing rapidly into plasma cells that produce antibodies - Secondary response
- These cloned plasma cells produce antibodies that exactly fit the antigens on the pathogens surface
- 4. The antibodies will then attach to the antigens on the pathogen and destroy them - Primary response
- 3. The B Cells are then activated to divide by mitosis to give a clone of the plasma cells
- The phagocyte then presents the bacterium antigens on its cell surface
- 2. T Helper Cells then attach to the antigens on the B Cells thereby activating them
- By Noor 12A.
- Cell mediated immunity
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