The Immune System

2. ______ Cells: Clones of B-Cells that can produce a single kind of antibody
5. ______ region - the part of an antibody that forms the antigen binding site
7. T ________ and B __________ - WBCs involved in the immune response
9. The process by which specific B or T-helper cells are chosen to undergo expansion (no space)
10. hold together to polypeptide chains of antibodies (no space)
11. A type of WBC that has a kidney-bean shaped nucleus and non-grainy cytoplasm
12. The name given to antibodies that clump pathogens together
16. T ______ Cells - release substances that activate B-Cells and T-Killer Cells
17. A type of WBC found in blood and tissue that engulfs pathogens

1. T _______ Cells - suppress immune responses from other WBCs stopping the immune system attaching itself
3. A molecule found on the surface of a cell that is recognised as foreign
4. ________ ___ Cells - record the specific antibody needed to bind to an antigen (no space)
6. Cells that process and present a pathogen's antibodies on their own surface to activate the immune system (APCs) (no space)
8. Special molecules in the blood that help with phagocytosis
11. The nucleus of neutrophils is said to be _______-________ because it looks like 3 interconnected blobs (no space)
13. You can recognise an RBC under the microscope because it has no ________
14. Contains digestive enzymes to break down a pathogen
15. The vesicle containing the pathogen in the cytoplasm of an engulfing cell