MICROANATOMY

Detailed explanation-1: -epithelium appears to have two or three layers of cells, but all the cells are in contact with the basement membrane. Rationale: A pseudostratified columnar epithelium is a special type of simple epithelium that consists of a falsely-stratified single layer of epithelial cells resting on a basement membrane.

Detailed explanation-2: -In pseudostratified epithelium, all the cells reach the basement membrane even though the nuclei will lie at different levels in the tissue, reflective of the irregular layering of tall and thin cells. However, only the taller cells will reach the free surface.

Detailed explanation-3: -The types of epithelia are classified by the shapes of cells present and the number of layers of cells. Epithelia composed of a single layer of cells is called simple epithelia; epithelial tissue composed of multiple layers is called stratified epithelia. Table 1 summarizes the different types of epithelial tissues.