Ace the NARM Midwifery Exam 2025 – Deliver Your Dream Career with Confidence!

The hormone that primarily stimulates testosterone production is luteinizing hormone (LH). LH is secreted by the anterior pituitary gland and plays a critical role in the male endocrine system. It prompts the Leydig cells in the testes to produce testosterone in response to signals from the hypothalamus and other hormones.

Gonadotropin-releasing hormone (GnRH), while essential in the hormonal cascade that starts the process, specifically stimulates the anterior pituitary to release LH and follicle-stimulating hormone (FSH). Therefore, it indirectly influences testosterone production by initiating the secretion of LH but does not directly stimulate its production.

FSH primarily helps in the regulation of spermatogenesis and does not directly stimulate testosterone production itself. Estrogen, while present in males, acts more as a secondary hormone and does not play a significant role in stimulating testosterone production. Understanding these roles clarifies why LH is the correct answer regarding direct stimulation of testosterone synthesis.