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10 Cards in this Set
- Front
- Back
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3 surfaces of epithelial tissue
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Free
Basal Lateral |
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What are the characteristics of the basement layer?
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Extracellular: formed by secretions of both epithelium and connective tissue. Acellular "glue"
Attachment to connective tissue Acts as a filter (diffusion) Not every epithelium has a basement membrane associated with it |
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Characteristics of Epithelial Tissue
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Consists almost entirely of cells
Covers body surfaces and forms glands Avascular - gets nutrients from blood vessels Can regenerate through mitosis Distinct "top" surface not connected to any other cells |
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Functions of Epithelial Tissue
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Protect underlying structures
Act as a barrier Permit the passage of substances Secret substances Absorb substances |
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How are epithelium cells classified?
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Number of layers of cells
Shape of cells |
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Name the three layers of epithelial cells
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Simple
Stratified Pseudostratified |
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Define Simple Epithelium
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One layer of cells. Each extends from basement membrane to the free surface
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Define Stratified Epithelium
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More than one layer. Shape of cells of the apical layer used to name the tissues. Includes transitional epithelium where the apical cell layers change shape depending upon distension of the organ which the tissue lines
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Define Pseudostratified
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Tissue appears to be stratified, but all cells contact basement membrane so it is in fact simple
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Define squamous
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Flat, scale like
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