The major disadvantage of a blood-brain barrier is that ____.
A) many chemicals can easily diffuse into the brain
B) so much glucose is required to maintain it
C) certain required chemicals must be actively transported
D) viruses cannot escape

Question

Quizplus · Accepted Answer

The blood-brain barrier serves as a selective physical barrier, allowing certain required chemicals to be actively transported into the brain while preventing the passage of potentially harmful substances. However, this active transport mechanism requires energy and may limit the availability of certain vital nutrients and medications.

The Major Disadvantage of a Blood-Brain Barrier Is That ____