GENERAL HISTOLOGY

Detailed explanation-1: -In the respiratory tract, the columnar epithelial tissue has cilia. These are hair like projections on the outer surface of the epithelial cells. This type of epithelium is known as ciliated columnar epithelium .

Detailed explanation-2: -The columnar epithelium present in the respiratory tract has hair like projection present on their surface, called cilia. Hence, it is called cilliated columnar epithelium.

Detailed explanation-3: -Cilia: Cilia are tiny, hair-like, motile (they can move) structures on the surface of the cell that help move entire cells or can move substances along the outer surface of the cell. Ciliated cells usually have hundreds of cilia on their surfaces.

Detailed explanation-4: -The hair follicle is composed of epidermal (epithelial) and dermal (mesenchymal) compartments and their interaction plays an important role in the morphogenesis and growth of the hair follicle [1, 2].

Detailed explanation-5: -The ciliated, pseudostratified columnar epithelium lining the respiratory tract from the nasal passages to the level of the respiratory bronchioles contains serous, mucous, and mixed tubuloalveolar glands in its lamina propria.