Chapter 13

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Across
  1. 1. Immune response where antibodies defend against pathogens in body fluids
  2. 6. T cells that directly kill infected or abnormal cells
  3. 8. A substance that triggers an immune response from B or T cells
  4. 9. Cells that process and present antigens to T cells
  5. 10. White blood cells that are key players in adaptive immunity
  6. 14. T cells that suppress or control immune responses
  7. 15. The specific part of an antigen that binds to an antigen receptor
Down
  1. 2. cells activated B cells that secrete antibodies
  2. 3. The introduction of antigens to stimulate immunity and memory without causing disease
  3. 4. A Y-shaped protein on B cells that binds specific antigens
  4. 5. A specific immune response that develops more slowly and creates memory against pathogens
  5. 7. T cells that activate and direct other immune cells
  6. 11. histocompatibility complex Molecules that display antigen fragments on cell surfaces for T cell recognition
  7. 12. A receptor on T cells that recognizes antigen fragments presented on MHC molecules
  8. 13. cells Long-lived cells that remember a pathogen for faster future responses