Final answer:
Drugs that affect the brain by increasing activity are commonly misused. Insulin and melatonin do not increase brain activity, while dopamine and adrenaline can increase brain activity.
Step-by-step explanation:
Drugs that affect the brain by increasing activity are the most commonly misused ones.
- Insulin: Insulin is a hormone that regulates blood sugar levels and does not directly affect brain activity.
- Melatonin: Melatonin is a hormone that helps control sleep-wake cycles and does not increase brain activity.
- Dopamine: Dopamine is a neurotransmitter that plays a role in pleasure, reward, and motivation. It can increase brain activity and is commonly misused in drugs like cocaine and methamphetamine.
- Adrenaline: Adrenaline, also known as epinephrine, is a hormone that is released during times of stress or excitement. It increases heart rate and blood pressure, but does not directly affect brain activity.
Learn more about Drugs affecting brain activity