Chapter 4 Outline

Chapter 4 Outline - Vandan Desai BIOL 251Anatomy &...

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Vandan Desai 1 Chapter 4—Tissue: The Living Fabric I. Preparing Human Tissue for Microscopy (pp. 114–115) A. Tissue specimens must be fixed (preserved) and sectioned (sliced) thinly enough to allow light transmission. B. Tissue sections must be stained with dyes that bind to different parts of the cell in slightly different ways so that anatomical structures are distinguished from one another. II. Epithelial Tissue (pp. 115–124; Figs. 4.1–4.6) A. Features of Epithelia (p. 115) 1. An epithelium is a sheet of cells that covers a body surface or lines a cavity. 2. Epithelium occurs in the body as covering or lining epithelium, and as glandular epithelium. B. Special Characteristics of Epithelium (pp. 115–116) 1. Composed of closely packed cells with little extracellular material between. 2. Adjacent epithelial cells are bound together by specialized contacts such as desmosomes and tight junctions. 3. Exhibits polarity by having an apical surface (free) and a basal surface (attached). 4. Supported by the underlying connective tissue. 5. Innervated but avascular. 6. Has a high regeneration capacity. C. Classification of Epithelia (pp. 116–121; Figs. 4.1–4.3) 1. Each epithelial tissue is given two names. a. The first name indicates the number of layers present, either simple (one) or stratified (more than one). b. The second name describes the shape of the cells. 2. Simple epithelia are mostly concerned with absorption, secretion, and filtration. a. Simple squamous epithelium is a single layer of fish scale–shaped cells. b. Simple cuboidal epithelium is a single layer of cube-shaped cells forming the smallest ducts of glands and many kidney tubules. c. Simple columnar epithelium is a single layer of column-shaped cells that line the digestive tract. d. Pseudostratified columnar epithelium contains cells of varying heights giving the false impression of the presence of many layers. 3. Stratified epithelia’s main function is protection.
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This note was uploaded on 03/08/2010 for the course BIOL 251 taught by Professor Fleischmann during the Fall '08 term at UMBC.

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Chapter 4 Outline - Vandan Desai BIOL 251Anatomy &...

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