epithelium…

Medical experts recommend this detailed explanation.

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epithelial cells, epithelial cells term "epithelium", cells that line hollow organs, glands, make up the outer surface, epithelial cells help to protect, enclose organs, produce mucus, secretions, certain types of epithelial cells have tiny hairs, cilia, help remove foreign substances, respiratory tract, epithelial cells, arranged in single layers, multiple layers, depending on the type.