Across
- 1. smooth muscle Muscle fibers causing bronchospasm
- 3. mainstem bronchus Longer, narrower, more angled bronchus
- 7. Ridge where trachea bifurcates
- 8. mainstem bronchus Shorter, wider, more vertical bronchus
- 10. Right lung has 3, left lung has 2
- 11. Entry space into alveolar sac
- 12. bronchi Last bronchi with cartilage plates
- 16. Tube with 15–20 C-shaped cartilage rings
- 17. cartilage rings Support trachea, open posteriorly for esophagus expansion
- 20. ducts Tiny passages leading to alveolar sacs
- 21. sacs Grape-like clusters of alveoli
- 22. bronchi Smaller branches ~1–4 mm diameter
- 24. Permanent opening created in trachea
Down
- 2. bronchioles First part of respiratory zone
- 4. Surgical opening in trachea with tube placed
- 5. fissure Separates upper and middle lobes of right lung
- 6. rings C-shaped structures preventing tracheal collapse
- 9. Airways <1 mm, no cartilage, smooth muscle
- 13. bronchi Branches supplying each lung lobe
- 14. fissure Separates lobes in both lungs
- 15. Right lung has 10, left lung has 8
- 16. bronchioles End of conducting zone, ~0.5 mm diameter
- 18. bronchi Branches supplying lung segments
- 19. Single air sac for gas exchange
- 23. Surgical incision into trachea