respiratory system

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Across
  1. 2. inflating and deflating the lung
  2. 4. an acidic colorless gas
  3. 7. connect the bronchus to the alveoli
  4. 8. sends air to the lungs
  5. 10. breath in and out from,and smell from
  6. 11. smallest numerous of the blood vessels
Down
  1. 1. net passive movement of molecules
  2. 3. organ that collects the air
  3. 5. member of the chalcogen
  4. 6. exchange oxygen and carbon dioxide
  5. 7. splits the air into each lung
  6. 9. protects the organs