THE RESPIRATORY SYSTEM

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Across
  1. 1. takes place at the respiratory membrane
  2. 4. where diffusion of gases occurs
  3. 6. number of iron ions in hemoglobin
  4. 8. notch, indentation on the left lung that
  5. 11. respiration that involves exchange of
  6. 12. in cells
  7. 14. movement of air into and out of lungs
  8. 15. can be bound to a hemoglobin
  9. 16. respiration that involve exchange of gases between blood and body cells
  10. 17. between lungs and blood
Down
  1. 2. product form with oxygen combines with Fe
  2. 3. protein molecule in blood that binds
  3. 5. cells which produce surfactant
  4. 6. maximum number of oxygen molecules
  5. 7. the heart
  6. 9. hemoglobin
  7. 10. respiration that involves oxygen
  8. 13. inflammation of the pleural membranes
  9. 15. airway; windpipe