Blood brain barrier in adults have _________ junctions between cells.

tight

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adhering

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gap

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none of these

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Solution

The correct option is A tight
The blood-brain barrier (BBB) is formed by the endothelial cells of cerebral microvessels, providing a dynamic interface between the peripheral circulation and the central nervous system. The tight junctions (TJs) between the endothelial cells serve to restrict blood-borne substances from entering the brain.

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