biology

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Across
  1. 4. tubes from trachea to lung
  2. 7. air sacks in the lungs
  3. 9. bones that divide the nasal cavity
  4. 10. respiratory center of brain
Down
  1. 1. cavity where lung sit
  2. 2. voice box
  3. 3. also known as the windpipe
  4. 5. The nasal cavity lies above the bone that forms the roof of the mouth and curves down at the back to join the throat
  5. 6. the major muscle of respiration
  6. 8. where cellular respiration takes place