Question

question 2 of 6
drugs that affect the brain by increasing ______ activity are the most commonly misused ones.

• insulin
• melatonin
• dopamine
• adrenaline

Explanation:

To solve this, we analyze each option:

• Insulin: Regulates blood sugar, not related to common drug misuse affecting brain reward.
• Melatonin: Regulates sleep, not commonly misused for brain activity increase.
• Dopamine: Associated with reward, motivation. Drugs like stimulants, opioids misused to increase dopamine activity, making it the correct choice.
• Adrenaline: Related to stress response, not the most commonly misused for brain activity in this context.

Answer:

C. dopamine