Blood-Brain Barrier

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2.3.1 Blood-brain barrier
The blood-brain barrier (BBB) is a diffusion barrier that is highly regulated, which keeps the blood and intercellular fluid seperated and is highly selective towards molecules on the basis of their polarity and size. In other words, BBB maintains reasonable homeostasis in CNS. BBB allows passive passage of some gasses and water, and selective diffusion of vitaly important amino acids and glucose for the function of neurons in the brain [5].

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