MCAT Question A Day - 5/18/13 - Answer!
Support cells in the testes called Sertoli cells (sustentacular cells) produce the hormone inhibin. One of the functions of this hormone is to inhibit FSH, which results in
A. speeding up sperm production.
B. slowing down sperm production.
C. speeding up testosterone production.
D. slowing down testosterone production.
The correct answer is (B). In males, FSH stimulates spermatogenesis. Thus, inhibin slows down further sperm production. Since inhibin does not inhibit ICSH, the hormone that stimulates testosterone production, choices (C) and (D) are not correct.
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