A) consists of both anatomical and physiological factors
B) regulates to some extent the passage of substances from the blood to the interstitial fluid of the brain
C) is anatomically related to the formation of tight junctions between adjacent capillary endothelial cells
D) All of the above are correct
Correct Answer: D
Solution :
Blood brain barrier (BBB) is a separation of circulating blood from the brain extracellular fluid. It occurs along all capillaries and consists of tight junctions around the capillaries that do not exist in normal circulation. Cells of barrier actively transport metabolic products such as glucose across the barrier with specific proteins.
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