BIO210Y5 Lecture Notes - Lecture 2: Stratified Squamous Epithelium, Dense Irregular Connective Tissue, Stratum Corneum
Document Summary
Epithelial tissue: - includes the surface of your skin. Organized groups of cells that types that cover exposed contain epithelial-derived cells surfaces that synthesize substances for and line internal caviies. secreion. Secretes onto external surfaces or internal passageways that connect to the exterior. Secrete hormones into the interstitial fluid that then enters the bloodstream. Functions of epithelial tissue: provide physical protection, control permeability regulation of any substance that enters or leaves the skin. Ex. calluses: provide sensation sensory nerves extensively innervate most epithelia, produce specialized secretions gland cells that are scattered among other cell types. The cells of epithelium share a number of basic features, it has an apical surface, which faces the exterior of the body and a base which is attached to adjacent tissues. Epithelial cells have 3 basic shapes: squamous, cuboidal, and columnar. Epithelium with just one layer is called simple epithelium whereas a stratified epithelium contains several layers.
