If a drug is found in the brain but does not possess the properties needed for passive diffusion through the blood-brain barrier then a researcher should conclude:
a. the drug entered the brain through active transport mechanisms.
b. the drug is synthesized and released from cells in the brain.
c. the properties of the substance were altered by brain glial cells.
d. nonspecific binding allowed the drug to pass through the blood-brain barrier.
Ans: A
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