Across
- 4. In the back of the throat,First line of defense
- 5. exhalation
- 8. Roof of the mouth
- 9. Air flows into the lungs
- 12. chemical receptor cells that detect muscle contraction
- 13. muscular passageway
- 14. Conchae Three uneven,scroll-like nasal bones
- 15. Air come trough these two openings
Down
- 1. Gas exchange is done through this process
- 2. Phospholipid that reduces surface tension in the alveoli
- 3. Air sacs in the lungs
- 5. Top of the larynx is a flap of tissue
- 6. Windpipe
- 7. Air-filled cavities that surround the nose
- 10. lungs surrounded by thin double-walled
- 11. Thin-walled branches of the bronchi