Normal Histology | Histology Image Gallery | Lung

The lung, and the respiratory system is divided into the conducting portion and the respiratory portion, which allows for the exchange of gases. The conducting portion consists of thick tubes of tissue which clean and humidify air through a pseudostratified ciliated columnar epithelium with goblet cells on top of a connective tissue lamina propria. This gradually changing as you go closer to the alveoli to cuboidal cells and then squamous-like cells with loss of goblet cells, then ciliated cells. The connective tissue cartilage, smooth muscle cells and seromucous cells disappear, with only pneumocytes left at the ends forming the alveolar sacs and ducts.

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