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Epithelial tissues are sheets of tightly packed cells that cover body surfaces, line cavities, and form glands. They provide protection, secretion, absorption, and sensory functions. One common type is simple squamous epithelium, composed of a single layer of flat cells. It facilitates diffusion and filtration and is found in the alveoli of lungs, glomeruli of kidneys, and lining of blood _________ ______ ____ __________ __________ ______ _______ __________ _______ __________ __________ _______.
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