Question

In the respiratory tract, the columnar epithelial tissue also has ___ ,

which are hair-like projections on the outer surfaces of epithelial cells.

Answer 1

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. These hair-like projections help trap dust particles from entering the respiratory tract and its flap like movement in one direction helps to eliminate these wastes out of the body along with mucus.