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How the cells in epithelial tissue maintain difference between environments on either side of the epithelium?
HAI,Samarth mishraThe word epi- represents exterior.Most of the type of epithelial tissue exists as protective layers by tranforming them selves from one form to the other form.such as changing themselves fromStratified epithelium to⇔ Keratinised epithelium to ⇔Complex epitheliumexample for better understanding is1.Secretion of sweat sebum from skin layers2.Formation of hair on skin (to exchange heat from body)3.Chage in colour due to melanin secretion in skin cells(Melanocytes)The above examples are modifications of epithelial cells towards different external environnment.
In a cell, the apical and basolateral surfaces are separated by a tight intercellular seal called the tight junction, which prevents the passage of even small ions through the space between adjacent cells and thus it helps in maintaining the difference between environments on either side of the epithelium. Hope you under the answer.
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