Cerebrospinal fluid is produced by ______ and it __________.
A. dura mater; maintains a stable ionic concentration in the CNS
B. choroid plexuses in the ventricles; protects the brain from blows to the skull
C. arachnoid villi in the dura sinus; provides a pathway to the blood for waste
D. capillaries in the dura mater of the ventricles; moistens the surface of the brain
E. the spinal cord; protects the CNS.
Answer: B. choroid plexuses in the ventricles; protects the brain from blows to the skull
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