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13 Cards in this Set
- Front
- Back
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tissues |
cells of similar type and function clustered into layers, sheets or groups |
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the 4 primary types of tissues |
-epithelial tissue -connective tissue -muscle tissue -nervous tissue |
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the main functions of the 4 primary types of tissues |
-epithelial tissues (covers and lines) -connective tissues (provides support) -muscle tissue (enables movement) -nervous tissue (controls work |
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excretions |
substances that ultimately leave the body such as sweat, urine, and feces |
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secretions |
substances that remain within the body such as regulatory molecules and mucus |
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the main functions of epithelial tissues |
-protects, covers, lines -filters biochemical substances -absorbs nutrients -provides sensory input -manufactures secretions -manufactures excretions |
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innervated |
having a nerve supply |
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general characteristics of epithelia |
-epithelial cells are polar -epithelial cells have an apical and a basal surface -epithelial cells have junctional complexes -epithelial cells are avascular -epithelial cells are innervated |
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apical surface of a cell |
the side of the cell that faces the lumen or the body cavity |
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the basal surface of the cell |
the side of the cell that faces the underlying connective tissue |
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junctional complexes |
-the point at which epithelial cells join to one another in very close proximity -the plasma membranes of epithelial cells are joined to form specialized attachments |
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how to epithelial cells obtain nutrients and oxygen? |
-epithelial cells are avascular -all epithelial cells lack blood vessels or capillaries and rely on underlying connective tissue to provide oxygen and nutrients |
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what are the 3 major types of cellular junctions found between epithelial cells? |
-tight junctions -desmosomes -gap junctions |
