The primary function of epithelial tissue is to provide covering or lining to organs and cavities, forming barriers that protect underlying tissues and regulate the exchange of materials between different body compartments and the external environment.
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Epithelial tissue forms the lining of various organs and structures in the body. Examples include the skin (epidermis), digestive tract (lining of the mouth, stomach, intestines), respiratory tract (lining of the trachea, bronchi), urinary bladder, reproductive tract (uterus, vagina), endocrine glands (thyroid, pancreas), and blood vessels (endothelium). Epithelial tissue serves functions such as protection, absorption, secretion, and selective permeability.