Question

question 2 of 6 drugs that affect the brain by increasing __________ activity are the most commonly misused ones. insulin melatonin dopamine adrenaline

Explanation:

Dopamine is a neurotransmitter associated with the brain's reward - system. Drugs that increase dopamine activity are highly addictive and commonly misused. Insulin regulates blood - sugar, melatonin is related to sleep - wake cycles, and adrenaline is involved in the body's fight - or - flight response.

Answer:

C. dopamine