PART B: Which detail from the text best supports the answer to Part A? A. “Chemical messengers in the brain are called neurotransmitters. They shuttle across the spaces between cells.” ( Paragraph 2)
B. “To move normally, patients with Parkinson’s take a drug that lets them make more dopamine, or they get an implant that stimulates deep regions of the brain.” ( Paragraph 4)
C. “Lowering dopamine can make animals lose pleasure in activities like eating and drinking. This joyless state is called anhedonia.” ( Paragraph 6)
D. “Drugs such as cocaine, nicotine and heroin cause huge boosts in dopamine. The ‘high’ people feel when they use drugs comes partly from that dopamine spike.” ( Paragraph 8)