I was reading TPR biology and came across this question on pg.326. I dont understand why this would happen. I expected the opposite since testosterone stimulates spermatogenesis and FSH stimulates sertolli cells aid spermatogensis. So wouldn't it be high lebels of testosterone would lead higher levels of FSh in the blood?

Anybody?

Hypothalamus --> GnrH ---> Anterior Pituitary ----> LH --> Leydig cells ---> testosterone.

To counter the effects of too much testosterone, testosterone does a negative feedback on the hypothalmus to inhibit GnrH which inhibits both LH and FSH.