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.

Question

Quizplus · Accepted Answer

Specialized ependymal cells in the choroid plexus use both active and passive transport mechanisms to secrete cerebrospinal fluid (CSF) and regulate the exchange of materials between the blood and CSF.

Materials Are Able to Enter the CSF from the Blood