Across
- 4. alveoli (air sac)
- 5. bronchiole
- 6. pleura (lungs' membrane)
- 8. breathing
- 10. nose
- 11. diaphragm
- 12. ribs
- 14. oxygen
Down
- 1. larynx, voice box
- 2. sternum
- 3. carbon dioxide
- 6. pharynx, throat
- 7. trachea, windpipe
- 9. air, lungs
- 13. sinus (hollow space)