1. The Respiratory System
Trachea (No.3)
Lung (No.31)
Jun Zhou
School of Medicine, Zhejiang University

2. Trachea C-shape hyaline cartilage Mucosa（粘膜） Submucosa（粘膜下层）
Adventitia（外膜）

3. Mucosa:ciliated,pseudostratified epithelium+lamina propria
submucosa
adventitia
Mucosa:ciliated,pseudostratified epithelium+lamina propria
Submucosa:denser CT+mucous,serous glands
Adventitia:hyaline cartilage（透明软骨）+CT

4. Posterior border: numerous glands+ smooth muscle

5. Mucosa （粘膜）
1.Pseudostratified columnar ciliated epithelia
goblet cell, cilia cell and basal cell, brush cell and small granule cell
2.Obvious basement membrane
Submucosa（粘膜下层）
Tracheal glands
(serous 浆液性, mucous 粘液性)

6. Lung Conducting portion（导气部）: Small bronchi Bonchioles
Terminal bronchioles
Respiratory portion（呼吸部）:
Respiratory bronchioles
Alveolar ducts
Alveolar sacs
Alveoli

7. Human lung (NO.31) Respiratory bronchiole 呼吸性细支气管 Bronchia Bronchiole
Terminal bronchiole
终末细支气管
Bronchia
小支气管

8. Conducting portion（导气部）
Bronchiole
Bronchia
Terminal bronchiole

9. Small bronchi
pseudostratified ciliated epi.
Smooth muscle in lamina propria
Incomplete cartilage rings

10. Bronchiloes
Smaller lumen and thinner wall
Epi from pseudostratified columnar to simple cuboidal
Rare goblet cell, glands and cartilage
More smooth muscle

11. Terminal bronchiloes
Simple cuboidal ciliated epi.
No glands, cartilage
Completed layer of smooth layer

12. Respiratory portion （呼吸部）
Respiratory branchioles（呼吸性细支气管）:
Wall with alveoli opening on it.
Alveolar ducts（肺泡管）:
Almost no walls, with smooth muscle knob
Alveolar sacs（肺泡囊）:
No smooth muscle knob
Alveoli（肺泡）:
Actual site of gas exchange

13. Respiratory portion
Alveolar duct
Respiratory bronchiole
Alveolar sac

14. Pulmonary Alveoli Type I alveolar cell Type II alveolar cell
Alveolar septum

16. Dust cell
phagocytose carbon or dust particles

17. Alveoli with dust cells in the septa

18. Pulmonary artery and vein (肺动静脉) Bronchial artery and vein (支气管动静脉)
肺动脉
支气管动脉
肺动脉
肺静脉

20. Blood-air barrier

22. Lab reports:
Lung：
File name: name+ID+Respiratory system( )
1.Conducting portion（导气部）:
Small bronchi
Bonchioles
Terminal bronchioles
2.Respiratory portion（呼吸部）:
Respiratory bronchioles
Alveolar ducts
Alveolar sacs
Alveoli
3. Dust cell （尘细胞）

23. The end!