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What is the function of tight junctions in epithelial cells?

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What is the function of tight junctions in epithelial cells?

(a) Separation of fluids

(b) Biocatalyst to enzymes

(c) Protection

(d) Support and structure

The question was posed to me in an international level competition.

This interesting question is from Cell Interactions topic in chapter Extracellular Matrix and Cell Interactions of Cell Biology

1 Answer

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Correct answer is (a) Separation of fluids

For explanation: The tight junction is made up of multi-protein complexes, which helps in regulating the transport mechanism. In epithelial cells, the tight junction is useful in separating the extracellular fluids.

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