Immune System

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Across
  1. 2. bacteria cause disease by releasing ______
  2. 6. disease An illness caused by pathogens that can be spread from one living thing to another
  3. 8. An example of a helminth is a ______
  4. 10. Single-or multi-celled parasitic organism
  5. 11. White blood cells that help the body fight pathogens
  6. 13. One way to prevent the spread of pathogens
  7. 15. Immunity that results from introducing antibodies into a person's blood-stream
  8. 17. A parasitic worm
  9. 18. Athlete's foot is caused by a ____
  10. 19. This is the first line of defense in the immune system
  11. 20. The smallest known pathogen
Down
  1. 1. An example of active immunity
  2. 3. Pathogens are spread by ____
  3. 4. A substance containing dead or weakened pathogens that is introduced into the body to give more immunity
  4. 5. The ____ known pathogen is a virus
  5. 7. Single-celled microorganisms
  6. 9. Pathogens that grow inside living cells and resemble bacteria
  7. 12. throat _____ is caused by a bacteria
  8. 14. A germ that causes disease
  9. 16. These contain chemicals that kill pathogens