Human Body

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Across
  1. 7. tiny sacs of lung tissue specialized for the movement of gases between air and blood
  2. 8. system Fourth level of organization
  3. 9. runt of all the puppies
  4. 11. tunnels bringing air to the lungs
  5. 13. Second level of organization
  6. 14. Blood Cell fights disease
  7. 15. Smallest unit; first level of organization
Down
  1. 1. Third level of organization
  2. 2. filters waste and other materials from blood
  3. 3. airways in the lungs that lead from the bronchi to the alveoli
  4. 4. helps you to breathe
  5. 5. cover the inner surface of the small intestine where digested food is absorbed
  6. 6. Fifth level of organization
  7. 10. leaving the airport
  8. 12. going back to the airport