Across
- 5. smallest branches of the bronchi
- 7. thin hairs attached to the mucous membrane epithelium linging the respiratory tract
- 9. lower portion of the lung
- 11. the outer fold of pleura lying closest to the ribs and wall of the thoracic cavity
- 12. one of the air cavities in the bones near the nose
- 15. air sac in the lung
- 17. muscle separating the chest and abdomen. It's the most important muscle for breathing
- 20. lid-like piece of cartilage that covers the larynx, preventing food from entering the larynx and trachea during swallowing
- 22. breathing out
Down
- 1. opening to the larynx
- 2. a gas produced by body cells when oxygen and food combines
- 3. space between the folds of the pleura
- 4. division of a lung
- 6. the inner fold of pleura lying closest to the lung tissue
- 8. branch of the trachea that is a passageway into the air spaces of the lung
- 10. region between the lungs and chest cavity
- 11. throat
- 13. uppermost portion of the lung
- 14. breathing in
- 16. collections of lymph tissue in the nasopharyx; also called pharyngeal tonsils
- 18. midline region where the bronchi, blood vessels, and nerves enter and exit the lungs
- 19. gas that passes into the bloodstream at the lungs and travels to all body cells
- 21. voice box
- 23. double folded membrane surrounding each lung