![This is blank.](https://digitalhistology.org/wp-content/themes/histology-unified/imgs/trans.png)
Alveolar duct
Alveolar ducts are formed by knobs lined by simple cuboidal epithelium, without cilia or club cells. The epithelium overlies very thin layers of connective tissue and strands of smooth muscle. The (inter)alveolar septum separating individual alveoli possesses a capillary bed where gas exchange occurs. 400x
![Alveolar duct <p>Alveolar ducts are formed by knobs lined by simple cuboidal epithelium, without cilia or club cells. The epithelium overlies very thin layers of connective tissue and strands of smooth muscle. The (inter)alveolar septum separating individual alveoli possesses a capillary bed where gas exchange occurs. 400x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.I.R.AD_.05.P01.png)
Alveolar duct
Alveolar ducts are formed by knobs lined by simple cuboidal epithelium, without cilia or club cells. The epithelium overlies very thin layers of connective tissue and strands of smooth muscle. The (inter)alveolar septum separating individual alveoli possesses a capillary bed where gas exchange occurs. 400x
![Knobs <p>Alveolar ducts are formed by knobs lined by simple cuboidal epithelium, without cilia or club cells. The epithelium overlies very thin layers of connective tissue and strands of smooth muscle. The (inter)alveolar septum separating individual alveoli possesses a capillary bed where gas exchange occurs. 400x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.I.R.AD_.05.P02.png)
Knobs
Alveolar ducts are formed by knobs lined by simple cuboidal epithelium, without cilia or club cells. The epithelium overlies very thin layers of connective tissue and strands of smooth muscle. The (inter)alveolar septum separating individual alveoli possesses a capillary bed where gas exchange occurs. 400x
![Epithelium <p>Alveolar ducts are formed by knobs lined by simple cuboidal epithelium, without cilia or club cells. The epithelium overlies very thin layers of connective tissue and strands of smooth muscle. The (inter)alveolar septum separating individual alveoli possesses a capillary bed where gas exchange occurs. 400x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.I.R.AD_.05.P03.png)
Epithelium
Alveolar ducts are formed by knobs lined by simple cuboidal epithelium, without cilia or club cells. The epithelium overlies very thin layers of connective tissue and strands of smooth muscle. The (inter)alveolar septum separating individual alveoli possesses a capillary bed where gas exchange occurs. 400x
![CT and smooth muscle <p>Alveolar ducts are formed by knobs lined by simple cuboidal epithelium, without cilia or club cells. The epithelium overlies very thin layers of connective tissue and strands of smooth muscle. The (inter)alveolar septum separating individual alveoli possesses a capillary bed where gas exchange occurs. 400x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.I.R.AD_.05.P04.png)
CT and smooth muscle
Alveolar ducts are formed by knobs lined by simple cuboidal epithelium, without cilia or club cells. The epithelium overlies very thin layers of connective tissue and strands of smooth muscle. The (inter)alveolar septum separating individual alveoli possesses a capillary bed where gas exchange occurs. 400x
![Alveoli <p>Alveolar ducts are formed by knobs lined by simple cuboidal epithelium, without cilia or club cells. The epithelium overlies very thin layers of connective tissue and strands of smooth muscle. The (inter)alveolar septum separating individual alveoli possesses a capillary bed where gas exchange occurs. 400x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.I.R.AD_.05.P05.png)
Alveoli
Alveolar ducts are formed by knobs lined by simple cuboidal epithelium, without cilia or club cells. The epithelium overlies very thin layers of connective tissue and strands of smooth muscle. The (inter)alveolar septum separating individual alveoli possesses a capillary bed where gas exchange occurs. 400x
![Interalveolar septa <p>Alveolar ducts are formed by knobs lined by simple cuboidal epithelium, without cilia or club cells. The epithelium overlies very thin layers of connective tissue and strands of smooth muscle. The (inter)alveolar septum separating individual alveoli possesses a capillary bed where gas exchange occurs. 400x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.I.R.AD_.05.P06.png)
Interalveolar septa
Alveolar ducts are formed by knobs lined by simple cuboidal epithelium, without cilia or club cells. The epithelium overlies very thin layers of connective tissue and strands of smooth muscle. The (inter)alveolar septum separating individual alveoli possesses a capillary bed where gas exchange occurs. 400x