Which of the following is NOT correct with reference to the blood brain barrier?
Select one:
-the barrier is permeable to glucose, alcohol, caffeine, nicotine, and anesthetic agents.

-the blood brain barrier is formed by the basement membrane and tight junctions between the
endothelial cells of the capillaries.

-the barrier is impervious to water, and prevents dehydration from affecting the brain.

-where the barrier is absent, HIV can enter the brain.

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