Structurally, the blood-brain barrier exists because
A) normal blood flow is at a pressure too high for the delicate brain tissue.
B) the hypothalamus regulates the permeability of the blood vessels.
C) the endothelial cells lining the CNS are extensively interconnected by tight junctions.
D) only water-soluble compounds are permitted to enter by passive diffusion.
E) None of the answers are correct.
C) the endothelial cells lining the CNS are extensively interconnected by tight junctions.
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