North American Registry of Midwives (NARM) Practice Exam

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Which hormone is responsible for stimulating testosterone production?

LH
FSH
Gn-RH
Estrogen

The correct answer is: Gn-RH

The hormone responsible for stimulating testosterone production is Luteinizing Hormone (LH). LH is secreted by the anterior pituitary gland and plays a crucial role in the regulation of the reproductive system in both males and females. In males, LH acts specifically on the Leydig cells in the testes, stimulating them to produce testosterone. Gonadotropin-releasing hormone (Gn-RH) is responsible for stimulating the release of LH (and FSH) from the pituitary gland but does not directly stimulate testosterone production itself. Follicle-stimulating hormone (FSH) primarily focuses on the development of sperm in males and the growth of ovarian follicles in females, and while FSH has an important role in male reproductive health, it does not directly stimulate testosterone synthesis. Estrogen is a hormone primarily involved in female reproductive processes, and while it is present in males, it does not have a direct role in stimulating testosterone production. Thus, LH is the key hormone that directly stimulates testosterone production in the male reproductive system.