NEET PG DENTAL EXAM

Detailed explanation-1: -The apical surface of epithelial cells, which lines the lumen of sac-and tube-shaped organs and the inner surfaces of the body cavities, forms the interface between the extracellular milieu and underlying tissues.

Detailed explanation-2: -Ciliated columnar epithelium is composed of simple columnar epithelial cells with cilia on their apical surfaces.

Detailed explanation-3: -The apical surface faces the lumen (inside of a hollow organ) while the basal or basolateral surface is adjacent to the underlying tissue. In many epithelia, the apical surface is specialized.

Detailed explanation-4: -Epithelial cells have a free surface called the apical surface. We often think of this part of the epithelial cell as the top of the cell, however, the free surface can face any direction so long as it is facing the external environment, such as the opening of a cavity or the surface of the skin.