Opioid agonists acting in the nucleus accumbens increase dopamine levels in the nucleus accumbens by:
a. inhibiting GABA neurons that terminate on dopamine neurons in the ventral tegmental area.
b. binding to opioid receptors on dopamine axon terminals.
c. by inhibiting glutamate neurons which no longer inhibit GABA neurons acting on dopamine neurons in the nucleus accumbens.
d. inhibiting opioid neurons which terminate in the ventral tegmental area.
Ans: A
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