respiratory system crossword

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Across
  1. 4. special cell that cleans up debris, bacteria
  2. 5. special cell that moves mucus out of lungs
  3. 7. special cell that produces surfactant
  4. 9. the voice box
Down
  1. 1. special cell that facilitates gas exchange
  2. 2. special cell that produces sticky mucus
  3. 3. the group of organs that are involved in breathing
  4. 6. where the bronchi are located
  5. 7. passage for air to go to the lungs
  6. 8. part of both digestive and respiratory system