-Many-layered; basal cells are cuboidal or columnar and metabolically active, surface cells are flattened (squamous). -Protects underlying tissues in areas subjected to abrasion. -Forms esophagus, mouth, vagina, skin.
-Single layer, cube-like cells, large nuclei. -Secretion and absorption. -Kidney tubules, ducts and secretory portions of small glands, ovary surface
pseudo stratified columnar epithelium
-Single layer of cells of differing heights, some not reaching the free surface, nuclei at different levels, bear cilia. -Secretion (mucous). -Line the trachea, upper respiratory tract.
-Single layer of flat cells, disk-like nuclei. -Allows passage by diffusion and filtration, lubricates. -Kidney glomeruli, air sacs (lungs), lining of heart, blood vessels, lymphatic vessels.