The ciliated columnar epithelium is simple columnar epithelial cells, but in addition, they possess fine hair-like outgrowths called as cilia on their free surfaces.
These cilia are capable of rapid, rhythmic, wavelike beatings in a certain direction. This movement of the cilia in a certain direction causes the mucus, which is secreted by the goblet cells, to move (flow or stream) in that direction.
Ciliated epithelium is usually found in the air passages like the nose. Trapped dust particles are cleaned from the respiratory tract by cilia. Stratified epithelium, glandular and sensory epithelium are not involved in the cleaning of the dust particles.