HISTOLOGY
EPITHELIAL TISSUE
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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: -Intercellular junctions are protein complexes on the basolateral cell membranes of epithelial cells. Their functions are to establish membrane polarity, connect adjacent cells and anchor the epithelial tissue to the connective tissue underneath it.
Detailed explanation-3: -Blood is a type of connective tissue with a fluid matrix called plasma. It has red blood cells, white blood cells and platelets. Blood is considered a type of connective tissue because it connects the body systems, transports oxygen and nutrients to all the parts of the body, and removes waste products.
Detailed explanation-4: -Epithelia do not have their own blood supply (avascular), they rely on diffusion for exchange of oxygen and metabolites. Epithelia contain specialised cell-cell junctions that bind adjacent cells to each other.