immune system

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Across
  1. 2. a type of medicine that trains the body's immune system so that it can fight a disease
  2. 5. the process of heating and cooling food to kill bacteria
  3. 10. a substance the makes your body create antibodies
  4. 13. plasma cells that produce antibodies
  5. 14. something in a vaccination
  6. 16. they help the body fight infection and otherdiseases
  7. 18. a lymphoid organ
Down
  1. 1. a microscopic organism not visible with the naked eye
  2. 2. cannot grow or reproduce without a living cell
  3. 3. a process that blood changes from a liquid to a gel
  4. 4. a chemical that kills or slows pathogens
  5. 5. an organism that causes disease
  6. 6. the body's ability to destroy pathogens before disease
  7. 7. the yellow substance in your blood
  8. 8. large Y-shaped proteins
  9. 9. the smallest working organisms
  10. 11. a type of cell within the body capable of swallowing and absorbing bacteria
  11. 12. a type of blood cell
  12. 15. the red liquid that goes around in the arteries and veins
  13. 17. the stuff in the middle of the bone