1 What does the neurotransmitter acetylcholine do? 2 How do antagonist substances affect acetylcholine?

3 How do agonist drugs affect a person?

4 What does dopamine affect?

5 How might a person with too much dopamine be affected?

6 Low levels of serotonin cause

7 The medicine Prozac helps depression by

8 Why do people feel or act differently after using caffeine, cocaine or alcohol? What is being affected?