Cerebrospinal fluid is produced by ________ and it ________.
A. dura mater; maintains a stable ionic concentration in the CNS
B. capillaries in the dura mater of the ventricles; moistens the surface of the brain
C. arachnoid villi in the dura sinus; provides a pathway to the blood for waste
D. choroid plexuses in the ventricles; protects the brain from blows to the skull
Answer: D
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Fill in the blank(s) with the appropriate word(s).