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Materials Are Able to Enter the CSF from the Blood

Question 322

Multiple Choice

Materials are able to enter the CSF from the blood supply because


A) there is always a lower concentration gradient in the CSF of all needed molecules.
B) the capillaries of the choroid plexus are highly permeable, allowing free exchange.
C) specialized ependymal cells use both active and passive transport to secrete CSF.
D) All of the answers are correct.
E) None of the answers are correct.

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