The Immune System

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Across
  1. 3. a B-cell or T-cell that has never been bound to anything is called this
  2. 4. a chemical barrier
  3. 7. swelling at the site of an injury is called
  4. 9. this substance is secreted by mast cells
  5. 11. communicates with our defense cells, tells them to keep reproducing
  6. 14. where T-cells mature
Down
  1. 1. a natural barrier
  2. 2. the medical term for white blood cells
  3. 5. the immune system has two parts
  4. 6. causes the immune system to react abnormally
  5. 8. the molecules found on the surface of pathogens
  6. 10. where B-cells are made
  7. 12. a common name for a bacteria or virus
  8. 13. a bacteria, virus or other microorganism that can cause disease