Final answer:
Testosterone and inhibin are two molecules that can inhibit testosterone production by communicating back to the brain.
Step-by-step explanation:
Testosterone and inhibin are two molecules that can inhibit testosterone production by communicating back to the brain. Testosterone binds to androgen receptors on the hypothalamus and the anterior pituitary, inhibiting the synthesis and secretion of gonadotropin-releasing hormone (GnRH), luteinizing hormone (LH), and follicle-stimulating hormone (FSH). This negative feedback loop helps regulate testosterone production.