Any substance that tries to leave the human bloodstream and get to the brain must first pass through the ___________.
A) cerebral ventricles
B) meningical filter
C) hypothalamus
D) blood-brain barrier

Question

Quizplus · Accepted Answer

The blood-brain barrier is a semi-permeable membrane that prevents many substances, including toxins and large molecules, from entering the brain. Therefore, any substance that tries to leave the human bloodstream and enter the brain must first pass through this barrier.

Any Substance That Tries to Leave the Human Bloodstream and Get