MCAT Behavioral Sciences Question 9: Answer and Explanation

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Test Information

Question: 9

9. If the amount of acetylcholinesterase, an enzyme that breaks down acetylcholine, is increased, which of the following would likely be the result?

  • A. Weakness of muscle movements
  • B. Excessive pain or discomfort
  • C. Mood swings and mood instability
  • D. Auditory and visual hallucinations

Correct Answer: A

Explanation:

If there were increased amounts of acetylcholinesterase, more acetylcholine would be degraded, lowering acetylcholine levels in the body. Low levels of acetylcholine would result in weakness or paralysis of muscles. Pain, choice (B), could result if one was injured and endorphins were found in low levels. Mood swings, choice (C), could be a result of varying levels of serotonin. Hallucinations, choice (D), have been seen to result from high levels of dopamine.

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