Which of these statements describes the blood-brain barrier?
A)It limits the direct exchange of materials between the cerebrospinal fluid and brain.
B)It is formed in part by the tight junctions between the brain capillary cells.
C) It consists of the astrocyte processes that encircle the brain capillaries.
D) It is a barrier between the meninges.

Question

Quizplus · Accepted Answer

The blood-brain barrier is formed in part by the tight junctions between the brain capillary cells, which limit the direct exchange of materials between the bloodstream and the brain. While astrocyte processes do play a role in supporting the barrier, they are not the primary component. The blood-brain barrier is not a barrier between the meninges, but rather a barrier between the bloodstream and the brain tissue.

Which of These Statements Describes the Blood-Brain Barrier