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Description of epithelial tissue

Give a brief description of the term epithelial tissues? And also write down their basic aspects and how is that function allocated to the features of tissue?

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Epithelial tissues, also named as epithelia, are tissues specialized in covering of external and internal surfaces of body.

The basic function of epithelium is to give impermeability and protection (selective permeability) to covered structure.

This justifies epithelium's typical aspects: the cellular juxtaposition forming layers of extremely proximate cells with diminished or none intercellular space among each two neighbor cells.

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