MCAT Biology Question 74: Answer and Explanation
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Question: 74
14. Excessive levels of dopamine in the brain are associated with psychosis. Accordingly, many antipsychotic medications block dopamine receptors. Which of the following effects may be seen in an individual taking antipsychotics?
- A. Increased secretion of growth hormone
- B. Decreased secretion of growth hormone
- C. Increased secretion of prolactin
- D. Decreased secretion of prolactin
Correct Answer: C
Explanation:
Dopamine is used in a number of neurological systems; most relevant to the endocrine system is the fact that dopamine secretion prevents prolactin release. Thus, an individual taking medications that block dopamine receptors would lose this inhibition on prolactin release and have elevated prolactin levels.