BIOC33H3 : Chapetr 4
11 Jul 2011
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In keratinized stratified squamous epithelium, the apical surface layers are dead. These cells lack nuclei and all organelles are filled with a tough, protective protein called keratin. New cells are produced in the basal region of the epithelium and migrate to the apical surface where they fill with keratin, lose their organelles and die. Therefore, there is a tradeoff with keratin in that tissue becomes very strong but the cells must die as a result! The epidermis of the skin consists of keratinized stratified epithelium. The cells remain alive all the way to its apical surface and are kept moist with a covering of mucus. Keratin- is a fibrous intracellular protein is not present with in these cells. Therefore, all the cells are laive , and the flattened nuclei character of epithelium are visible even in the most superficial cells. Found in oral cavity, part of pharynx= throat, the esophagus, vagina and the anus. www. notesolution. com.
