Immune System

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Across
  1. 3. The first line of defense that covers your body.
  2. 4. The part of the body where blood cells are made.
  3. 6. An illness caused by germs.
  4. 8. A germ that needs a host to survive.
  5. 9. A shot that helps your body prepare to fight disease.
  6. 10. The organisms that can make you sick.
Down
  1. 1. The body's defense system that fights germs.
  2. 2. Proteins that recognize and attack germs.
  3. 5. Cells that help destroy bacteria and viruses.
  4. 7. A raised body temperature that helps fight infections.