EPITHELIUM
EPITHELIAL TISSUES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The Free surface
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The connective tissue below the epithelial tissue
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Epithelial tissue does not need a blood supply because it is a dead cell layer
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It’s found in the epithelial layer
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Detailed explanation-1: -Epithelial layers contain no blood vessels (avascular), so they must receive nourishment via diffusion of substances from the underlying connective tissue, through the basement membrane.
Detailed explanation-2: -Epithelial tissues are nearly completely avascular. For instance, no blood vessels cross the basement membrane to enter the tissue, and nutrients must come by diffusion or absorption from underlying tissues or the surface. Many epithelial tissues are capable of rapidly replacing damaged and dead cells.
Detailed explanation-3: -Epithelial tissue has no blood supply and depends completely on the connective tissue beneath it to supply it with oxygen and nutrients. In what type of epithelia do some cells stack up on top of other cells but not touch the basement?
Detailed explanation-4: -The basement membrane itself creates a thin barrier between connective tissues and the most basal layer of epithelial cells. Specialized junctions called hemidesmosomes secure the epithelial cells on the basement membrane.