Most chemicals in the blood supply
A) enter the brain more easily than other organs.
B) are less likely to enter the brain than other organs.
C) enter the brain as easily as other organs.
D) are unable to enter the brain or other organs.

Question

Quizplus · Accepted Answer

The brain is protected by the blood-brain barrier, a selective permeability barrier that prevents most chemicals in the blood from entering the brain, making it less likely for chemicals to enter the brain than other organs.

Most Chemicals in the Blood Supply