What is true of the blood-brain barrier?
A. It is a valve-like structure that prevents the peripheral blood from mixing with the cerebrospinal fluid.
B. It requires special transporters to move amino acids and vitamins into the brain.
C. It is formed by pores in the blood vessel walls that control which molecules can pass through.
D. It does not allow lipid-soluble drugs to enter the brain.
Answer: B
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