Simple Cuboidal Epithelium – This type of Epithelium is composed of 1 layer of cells and are roughly equal in height and breadth with a spherical and centrally placed nuclei. They are usually located in secretory ducts of small glands and kidney tubules. Their main function is allow secretion and absorbtion.

Pseudostratified Columnar Epithelium – The nuclei for this epithelium are found at different levels, giving a false impression that the cells are in many layers. All of the cells reach a basement membrane though their nuclei will lie in different levels. They are mainly located in larger respiratory airways of the nasal cavity, trachea and bronchi. Their function is to secrete mucus which is moved with cilia.

Simple Squamous Epithelium – The cell types of this epithelium are flat and thin. Areas where this epithelium is found include the skin, capillary walls, glomeruli, pericardial lining, pleural lining, peritoneal cavity lining, and alveolar lining. This type of tissue is great in lining areas where passive diffusion of gases occur.