What keeps many drugs from readily passing from the blood into the brain?

Name: What keeps many drugs from readily passing from the blood into the brain?
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Question

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The blood-brain barrier is a specialized barrier in the brain's blood vessels that prevents certain substances, including many drugs, from entering the brain. This is because the barrier is made up of tightly packed cells that only allow certain molecules to pass through.

What Keeps Many Drugs from Readily Passing from the Blood