ANAT 101 Lecture Notes - Lecture 2: Eni, Werewolf, Nephron

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Epithelial tissue covers body surfaces, lines cavities and tubular structures, and serves essential functions. Epithelial tissue includes epithelia and glands. Glands are composed of secreting cells derived from the epithelial. Cells are often bound closely together or widely separated by extracellular material. A free surface exposed to the environment or to some internal chamber/passageway. Attachment to underlying connective tissue by a basement membrane. Absence of blood vessels, must obtain nutrients from deeper tissues. Continual replacement or regeneration of epithelial cells. Protect internal and external surfaces from abrasion, dehydration and destruction by chemical or biological agents. Any substance that enters or leave the body must cross an epithelium. Different epithelia have different permeability. Can detect changes in an environment. Can relay information about the environment to the nervous system. Exocrine- discharged onto the surface of the epithelium. Enzymes entering the digestive tract, perspiration on skin. Endocrine secretions are released into the surrounding tissue fluid and blood.

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