Immune system- 3 lines of defense
- Created by: unknownstruggler
- Created on: 27-04-16 17:38
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- Immune system- 3 lines of defence
- Second line of defence
- Non-specific
- Comes into action if pathagon passes 1st line of defence
- White blood cells
- Phagocytosis
- Phagocyte recognises antigens on pathagons
- Cytoplasm of phagocyte moves around pathagon engulfing it!
- Lysome fuses with phagocytic vacuole and enxymes break down the pathogen
- Presents Antigen on surface
- Pathagon contained phagocytic vacuole
- Lysome fuses with phagocytic vacuole and enxymes break down the pathogen
- Cytoplasm of phagocyte moves around pathagon engulfing it!
- Phagocyte recognises antigens on pathagons
- Phagocytosis
- First line of defence
- Non-specific
- Skin
- Psychical barrier
- Acidic PH kills microbes
- Mucous membrances
- Traps foreign pathagons
- Lines respiratory tract entrances
- Hairs and cilea
- Traps foreign pathagons
- Nose, ears,
- Urine
- Acidic fluid that has a protective element
- Tears, sweat and saliva
- Anti-bacterial properties
- External layer
- 3rd line of defence
- Specific immune response
- B-lymphocyte
- Covered in antibodies
- Bind to specific Antigen
- Antigen-antibody complex
- Antibodies join engulfing them
- Killer-T-cells Kill the Pathagon.
- Bind to specific Antigen
- Covered in antibodies
- T-Lymphocyte
- Receptors on surface
- Binds to specific antigen
- Activates T-Lymphocytes
- Divide to produce clones
- Clonal activation
- Helper-t-Cells
- Activate B-Lymphocytes
- B-lymphocyte
- Covered in antibodies
- Bind to specific Antigen
- Antigen-antibody complex
- Antibodies join engulfing them
- Killer-T-cells Kill the Pathagon.
- Bind to specific Antigen
- Covered in antibodies
- B-lymphocyte
- Activate B-Lymphocytes
- Killer-T-Cells
- Kill the pathagon
- Memory cells
- Remember the pathagon, to activate secondary response
- Clonal selection
- Divide to produce clones
- Activates T-Lymphocytes
- Binds to specific antigen
- Receptors on surface
- Second line of defence
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