Epithelial tissues have different types providing for specific functions, with multiple layers of cells being a common feature for protection.
Epithelial tissues serve various functions such as protection, diffusion, secretion, filtration, and absorption. Types of epithelium providing for these functions include cuboidal epithelium in the kidneys for secretion, squamous epithelium in the alveoli for diffusion, columnar epithelium in the intestines for absorption, and stratified epithelium in the skin for protection. A common structural feature of epithelia providing protection is multiple layers of cells to resist abrasion.
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