Final answer:
Inhibin, a hormone that inhibits FSH synthesis and release, is secreted by the Sertoli cells in the testes.
Step-by-step explanation:
Inhibin is a hormone that inhibits the synthesis and release of follicle-stimulating hormone (FSH). It is secreted by the Sertoli cells, which are found in the testes. The Sertoli cells produce inhibin in response to FSH, creating a negative feedback loop that regulates the levels of FSH and testosterone in the body.