Question

opioid users experience a sense of euphoria due to release of __________, but also a decrease in __________ release. serotonin; dopamine noradrenaline; dopamine dopamine; noradrenaline noradrenaline; acetylcholine

Explanation:

Opioids cause release of dopamine which leads to euphoria. They also decrease noradrenaline release.

Answer:

C. dopamine; noradrenaline