what is the function of epilithilial tissue what are three types of eplitilical tissue
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Answer:
Functions of epithelial cells include secretion, selective absorption, protection, transcellular transport, and sensing. Epithelial layers contain no blood vessels, so they must receive nourishment via diffusion of substances from the underlying connective tissue, through the basement membrane.
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Answer:
Functions of Epithelial Tissue
Epithelial tissue has a number of functions, which include protection against abrasion, radiation damage, chemical stress and invasion by pathogens. A single organ can have different types of epithelial tissue based on the substances to which different surfaces are exposed. Protective tissue tends to be thicker, made of multiple layers of cells and often has inclusions such as keratin to provide mechanical strength and resistance. The skin of most mammals contains layers of thick keratinized dead epithelial cells protecting them against water loss and other stresses. Similarly, the esophagus is also exposed to a wide range of different textures, pH levels and chemical compositions from food and drink. Therefore, it also contains protective epithelium. Due to its involvement in the digestive process, however, it remains non-keratinized, and secretes mucus to smoothen the passage of food.
Types of Epithelial Tissue
Squamous epithelial tissue: consists of extremely thin cells that resemble the scales of a fish
Cuboidal epithelial tissue: contains cells that appear square in cross-section but are marginally longer than they are wide
Columnar epithelial tissue: consists of elongated cell involved in absorption of materials
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