The function of the blood-brain barrier is to
A) keep neurons from innervating blood vessels.
B) provide an impenetrable barrier between blood and brain, because the brain gets all its nourishment from the cerebrospinal fluid.
C) prevent all contact between bloodborne molecules and brain tissue.
D) help protect the central nervous system.

Question

Quizplus · Accepted Answer

The blood-brain barrier helps protect the central nervous system by regulating the movement of substances from the bloodstream into the brain, allowing essential nutrients to pass while blocking harmful substances.

The Function of the Blood-Brain Barrier Is to