BIOL 2457Dr. HenrySI Leader: Madeline Perkins Epithelial TissuesName Function/Description Location Other FactsSimple Squamous -Flat cells, one layer-Filtration, diffusion and secretion -Capillaries, gas exchange-Endothelium and Mesothelium-Lines digestive tractEndothelium: Lines heart, blood vessels, lymphatic vesselsMesothelium: Serous membranes, pleuraSimple Cuboidal -Cube shaped cells; centrally located nucleus -Secretion and absorption-Thyroid glands -Kidney-PancreasSimple Columnar:Ciliated-Column shaped; oval nucleus near base of cell-Cilia for movement -Lining of the small intestine and uterine -Throat Have Goblet Cells that secrete mucus to aid in the movement of particles Simple Columnar:Nonciliated-Column shaped; oval nucleus near base of cell-No Cilia-Has Microvilli for movement on apical surface-Absorption and protection-Prevents the destruction of the stomach liningDoes not have Goblet CellsPseudostratified Columnar-Appears to have several layers-Nuclei are all at various depths-Ciliated: Secrete mucus and Cilia sweep Unciliated: No Goblet cells; absorption and protection-Trachea -Upper airways-Upper respiratory tractAll cells are attachedto the basement membrane but not all of them extend tothe apical surfaceName Function/Description Location Other FactsStratified Squamous-Several layers; cells are pushed up toward apical layer-Keratinized and Non-Keratinized-Protect against abrasion, water loss, UV radiation, microbes and foreign invasion -Keratinized: Superficial layers of the skin-Non-Keratinized: Mouth, VaginaKeratin increases in the cells closer to the surface of your skin as they harden and die Stratified Cuboidal and Stratified Columnar-Apical layers are cuboidal -Limited secretion and absorption-Protection -Esophagus-Sweat glands-Male urethraFairly rareTransitional Epithelium-Varies in appearance-Allows structures to expand while maintain protective lining -Found only in the urinary systemRelaxed state: CuboidalStretched state: