The Respiratory System

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Across
  1. 4. The bony framework of the thoracic cavity
  2. 5. Tiny air sacs at the end of the bronchioles
  3. 7. Air
  4. 8. A colorless, odorless gas
  5. 10. A tiny branch of air tubes in the lungs
  6. 11. A long, U-shaped tube
  7. 12. The movement of molecules
Down
  1. 1. The major muscle of respiration
  2. 2. Allow us to breathe
  3. 3. A thin tube
  4. 6. For breathing and smelling
  5. 9. A large airway