
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
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
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
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
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
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
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