Brain chemistry, drugs and disease Quiz
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5 questions, one answer each
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1. What causes the symptoms of Parkinson's disease?
- A. Excess dopamine in the synapses
- B. Loss of dopamine-releasing neurones
- C. Loss of myelin from motor neurones
- D. Blocked reuptake of serotonin
2. Why is L-Dopa given instead of dopamine?
- A. Dopamine is toxic
- B. L-Dopa blocks dopamine receptors
- C. Dopamine cannot cross the blood-brain barrier
- D. L-Dopa is not converted in the brain
3. How does an SSRI increase serotonin activity?
- A. It blocks reuptake so serotonin stays longer in the cleft
- B. It destroys serotonin receptors
- C. It increases serotonin breakdown
- D. It makes dopamine instead
4. Why might MDMA users feel low in mood for days?
- A. Serotonin stores in neurones are depleted
- B. The postsynaptic receptors have been destroyed
- C. Dopamine levels become far too high
- D. L-Dopa is released
5. A patient taking L-Dopa for eight years needs a higher dose. The best explanation is that
- A. the blood-brain barrier has widened
- B. fewer dopamine-releasing neurones remain as the disease progresses
- C. the drug has become toxic
- D. the patient has made more dopamine