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blood-brain barrier(BBB)
blood–cerebrospinal fluid barrier
the barrier that separates blood from brain tissue everywhere except in the hypothalamus. It is permeable to water, oxygen, carbon dioxide, and nonionic solutes such as glucose, alcohol, and general anesthetics;
it is only slightly permeable to electrolytes and other ionic substances. Some small molecules such as amino acids are taken across the barrier by specific transport mechanisms.

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