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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