Which of the following is true of the blood-brain barrier?
A) The barrier is uniform throughout the brain.
B) The barrier is selectively permeable.
C) The barrier functions to regulate the chemical composition of the cerebrospinal fluid.D) The barrier is formed by Schwann cells that line the capillaries of the brain.
E)The barrier is formed by astrocytes.
Answer: B
The blood-brain barrier is selectively permeable.
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