Across
- 4. The portion of an antibody that binds to an antigen. This is also the "hands" of the antibody.
- 6. The MHC molecules that alert killer T cells when something is not right inside a cell.
- 9. Proteins that are secreted by immune cells to communicate with other cells.
- 11. This part of an antibody determines the class of immune system cells that it binds to and determines its function. This is also the "tail" of the antibody.
- 12. The producers of antibodies.
- 13. The MHC molecules that inform helper T cells that there are problems outside a cell.
Down
- 1. The type of T cell that is a potent weapon that can destroy virus-infected cells directly.
- 2. The process of macrophages engulfing and ingesting larger bacterium.
- 3. Solves the problem of "how does the immune system know which B cells to make more of?" The second word to this phrase is selection.
- 5. The type of T cell that secrete chemical messages among immune cells to coordinate the immune response across the immune system.
- 7. These cells have the unique capability of self-renewal.
- 8. The first line of defense in the immune system; acts like a barrier against pathogens (includes mucus and skin).
- 10. The type of T cell that helps restrain the immune system so it does not overreact.