Final answer:
Sertoli cells secrete androgen-binding protein (ABP), which is stimulated by the follicle-stimulating hormone (FSH) and is essential for maintaining high levels of testosterone required for spermatogenesis.
Step-by-step explanation:
One of the functions attributed to the Sertoli cells is the secretion of androgen-binding protein (ABP). The follicle-stimulating hormone (FSH) released from the pituitary gland stimulates the Sertoli cells in the testes. These cells play a critical role in spermatogenesis by nurturing the developing sperm cells. Most importantly, in response to FSH, Sertoli cells secrete ABP, which binds to testosterone, maintaining a high testosterone concentration that is crucial for the proper development of sperm.