Biology / Bio 2737 · Atom · ~20 seconds
Epithelial Tissue: Simple and Stratified
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Epithelial tissue covers organs and lines body cavities in either a single layer, called simple epithelia, or multiple layers, called stratified epithelia, classified by cell shape.
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Simple squamous epithelia line lung alveoli for fast diffusion; stratified squamous epithelia protect skin from abrasion.
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Pseudostratified epithelia look layered from nuclei at different heights, but every cell still touches the base membrane as one layer.