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        | Microscopic anatomy- Study of tissues and cellular arrangement |  | 
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        | Cells and cell products that perform a similar structural or physiological role. |  | 
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        | Barrier/protective tissue |  | 
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        | Extracellular material. (Connective tissue) |  | 
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        | Ex. Collagen (strength) and elastin ("returns") |  | 
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        | Thick fluid composed of water, dissolved gases, nutrients, wastes, other chemicals. |  | 
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        | What is tissue composed of... |  | Definition 
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        | All cells of the body arise from a single cell |  | 
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        | Layers of  embryonic cells |  | 
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        | Forms skin and nervous tissue |  | 
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        | Forms muscle, bone and blood tissues |  | 
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        | Forms gastrointestinal and respiratory tissues |  | 
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        | Flat sheet of closely adherent cells |  | 
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        | A thin sheet of epithelial cells that forms a barrier between the environment and body tissues |  | 
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        | Epithelial cells that produce a chemical product Ex. Sweat glands of the skin
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        | One cell layer, surfaces meant for absorption. Ex.GI tract
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        | 2 to 20 cell layers, durable surfaces Ex. Skin
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        | Thing underlying sheet of connective tissue. Binds the epithelial cells to the body surface |  | 
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        | Stratified squamous epithelial, skin |  | 
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