Immune System 1

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Across
  1. 1. The body system that prevents and fights disease
  2. 3. A simple, single-celled microbe without a nucleus
  3. 8. The body's ability to protect itself from infection
  4. 9. A defence that kills pathogens before they can enter the body
  5. 10. A medical condition that can spread from person to person by a pathogen.
  6. 11. A protein that can identify and fight a specific pathogen
  7. 13. The protection from infection provided when most of a population is immune
Down
  1. 1. A medical condition that is caused by a pathogen
  2. 2. A painful redness or swelling of part of the body
  3. 4. A B cell that remains in the bloodstream to recognize pathogens
  4. 5. A white blood cell that produces proteins to attack pathogens
  5. 6. Barriers that prevent pathogens from entering the body
  6. 7. An invasion of the body by pathogens that then multiply
  7. 12. A medical condition with specific symptoms