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What is the free surface of epithelium called?
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Basal
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Oregano
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Apical
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Cloves
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The free surface of epithelium is called the apical surface. This surface is usually exposed to the external environment or to a body cavity and is involved in functions such as absorption, secretion, and protection. The apical surface may have various specialized structures, such as microvilli or cilia, depending on the specific function of the epithelial tissue.