What is meant by the term blood-brain barrier?

A) It filters unneeded nutrients, drugs, oxygen, and chemicals from the brain.
B) It permits the passage of all fluids, chemicals, and drugs into the brain.
C) It acts like a pump to supply the brain with needed nutrients and oxygen.
D) It is a filter that prevents most drugs from acting directly on the brain.


Answer: D) It is a filter that prevents most drugs from acting directly on the brain.

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