Questions: 24 1 point The blood-brain barrier is a protective barrier between the brain and the blood vessels around the brain, and no drug can penetrate this barrier. True False

The answer is False.

Explanation: The statement that "no drug can penetrate this barrier" is incorrect. While the blood-brain barrier (BBB) is indeed a protective barrier that restricts the passage of many substances from the bloodstream into the brain, it is not completely impermeable. Certain drugs and molecules can cross the BBB, especially those that are lipid-soluble or have specific transport mechanisms. For example, some medications for neurological conditions, such as certain antidepressants and antiepileptic drugs, are designed to penetrate the BBB to exert their effects on the brain. Additionally, researchers are continually developing new methods to enhance drug delivery across the BBB for treating various brain disorders.