Discuss the structure and function of epithelial tissues. How are they classified based on layers and cell shape?

Epithelial tissues are a type of tissue that form the covering of body surfaces, line cavities, and form glands. They are composed of tightly packed cells with minimal extracellular matrix, creating protective barriers. These tissues lack blood vessels and receive nutrients through diffusion from underlying connective tissues. They are attached __________ ____ ___ _____ ____ _____ ____ _______ ___ ________ _________ ________.
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