20. What role does follicle-stimulating hormone (FSH) play in men?
From Quiz Human Fertility
Answer:
Regulates sperm production
In men, FSH acts primarily on Sertoli cells, the "nurses" of the baby sperm cells, found in the testes. There, it helps support the development of sperm by promoting Sertoli cell proliferation and function, creating a happy environment for the little germ cells. Meanwhile, testosterone, which is stimulated by luteinizing hormone (LH), certainly plays a major role as well.
The division of labor in the testes is fairly simple, which is why most of this quiz is about women. FSH works through Sertoli cells, while LH that tells Leydig cells to make testosterone. FSH also helps Sertoli cells produce various substances that nourish and support developing germ cells.
In men, reduced FSH activity can cause relatively mild reductions in sperm production or much more serious problems, depending on the actual underlying cause.