Which statement best describes the blood-brain barrier?
A) It is a part of the immune system that facilitates the release of antibodies to protect the brain from infectious agents.
B) It is a property of the walls of brain capillaries that prevents large molecules from entering the brain.
C) It is a property of the blood vessels of the brain that promotes the diffusion of nutrients into the tissue of the brain.
D) It is a property of neurons that prevents them from accidentally releasing their neurotransmitters into the blood circulation.

Question

Quizplus · Accepted Answer

The blood-brain barrier is a property of the walls of brain capillaries that prevents large molecules from entering the brain. This barrier serves to protect the brain from potentially harmful substances in the blood, while also allowing for the diffusion of essential nutrients and oxygen.

Which Statement Best Describes the Blood-Brain Barrier