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Epithelial Cells.docx

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BIOL 1215

Epithelial Cells Epithelial tissue: -Consists of cells arranged in continuous sheets, in either single or multiple layers -Closely packed and held tightly together by many cell junctions, there is little intercellular space between adjacent plasma membranes. - Form covering and lining of the body -It is never covered by another tissue, so it always has a free surface 3 major functions: 1. Selective barrier that regulates the movement of materials in and out of the body 2. Secretory surfaces that release products produced by cells onto their free surface 3 .Protective surfaces resist abrasive influences of environment General Features of Epithelial Cells Surfaces of epithelial cells differ in structure and have specialized functions Apical (free) surface Faces the body surface, body cavity, lumen (interior space) of internal organs, or duct. May contain cilia or microvilli Lateral surfaces Faces adjacent cells containing cell junctions Basal surface Opposite of apical layer and adhere to extracellular materials. Area of Hemidesmosome junction (plasma membrane anchors basement membrane) General Features of Epithelial Cells Basement membrane Thin double extracellular layer that serves as the point of attachment and support for overlying epithelial tissue 1.
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