Across
- 2. muscle that helps you breathe
- 4. U-shaped tube
- 7. microscopic balloon-shaped structures located at the end of the respiratory tree.
- 8. allow us to breathe
- 9. large tubes that connect to your trachea
Down
- 1. strong, flexible connective tissue that protects your joints and bones
- 3. The space inside the nose
- 5. flap of cartilage
- 6. A tiny branch of air tubes in the lungs