Final answer:
Sertoli cells in the testes are stimulated by FSH and in turn support the stimulation of Leydig cells, which produce testosterone. Sertoli cells themselves secrete androgen-binding protein (ABP), which helps maintain high testosterone levels needed for sperm development.
Step-by-step explanation:
The Sertoli cells in the testes play a crucial role in the process of spermatogenesis. They are stimulated by follicle-stimulating hormone (FSH) and in turn, they stimulate the Leydig cells. The Leydig cells are responsible for the production of testosterone, an essential hormone for male reproduction. In this way, Sertoli cells indirectly contribute to testosterone production. Additionally, Sertoli cells secrete a hormone known as androgen-binding protein (ABP), which binds testosterone, maintaining high local concentrations necessary for sperm development.
Looking at the options provided: a) Leydig cells; secrete testosterone is incorrect because Leydig cells are not stimulated by Sertoli cells but rather by luteinizing hormone (LH). b) Granulosa cells; secrete estrogen is also incorrect as Granulosa cells are found in the ovaries, not testes. c) Germ cells; secrete inhibin is incorrect because germ cells do not secrete inhibin. d) Spermatogonia; secrete androgen-binding protein (ABP) is correct in the context that Sertoli cells secrete ABP, but spermatogonia do not. Therefore, the correct association would be that Sertoli cells stimulate Leydig cells and secrete androgen-binding protein (ABP).