The Immune System Crossword Puzzle

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Across
  1. 3. a protective defense where antibodies are produced by another individual
  2. 4. the defenses that arise when a pathogen infects the body
  3. 6. a type of white blood cell that can kill tumor cells and virus infected cells as part of innate immunity
  4. 9. a protein that helps defend against pathogens
  5. 11. a lymphocyte that has undergone clonal selection and is capable of mediating an adaptive immune response
  6. 13. the first immune response in which memory cells are first formed
  7. 15. a much stronger and more effective response of the immune system due to the recognition by memory cells
Down
  1. 1. a host protein that functions in antigen presentation
  2. 2. an organism or virus that causes disease
  3. 5. long-lived lymphocytes formed during a primary immune response that can give rise to effector cells if the same antigen is later
  4. 7. a form of defense common to all animals active immediately upon exposure to pathogens
  5. 8. a vertebrate-specific defense that is mediated by B and T cells that exhibits specificity memory and self and non-self recognition
  6. 10. a type of white blood cell that mediates immune responses. the two man classes are b cells and t cells
  7. 12. enables an animal to avoid or limit many cellular infections
  8. 14. any substance that elicit a response from a b cell or a t cell