In order to have an effect, drugs used to treat psychological disorders must be able to:
A) reduce neurotransmitter activity in the brain.
B) increase neurotransmitter activity in the brain.
C) cross from one side of a synapse to the other.
D) cross the blood-brain barrier.
Answer: D
Rationale: All psychotropic drugs are designed to cross the blood–brain barrier, a network of tightly packed cells that only allow specific types of substances to move from the bloodstream to the brain. Once in the brain, the drugs have their effect by either increasing or decreasing neurotransmitter activity.
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