Drugs of addiction impact the brain in several ways. Which statement is NOT listed as an effect?

• A. They can artificially cause changes by increasing release of neurotransmitters.
• B. They can imitate naturally occurring drugs.
• C. By changing the brain structure.
• D. They can artificially cause changes by inhibiting the reabsorption of neurotransmitters.

Answer: (C)

Drugs of addiction affect brain function primarily through how they alter neurotransmitter signaling. They can artificially increase the release of neurotransmitters, boosting activity in the brain’s reward pathways and reinforcing drug-taking behavior. They can imitate naturally occurring brain chemicals by binding to receptors and producing similar effects, acting like endogenous substances. They can also inhibit the reabsorption, or reuptake, of neurotransmitters, leaving more of the chemical in the synapse and prolonging its signaling. By contrast, the idea that drugs directly change brain structure isn’t typically listed as a direct effect in basic explanations of how these drugs act; while long-term use can lead to neuroadaptive changes, the primary, described mechanisms are changes in neurotransmitter release, receptor interaction, and reuptake. So the statement about changing brain structure isn’t considered one of the standard immediate effects.