Final answer:
The testes are responsible for producing the hormone testosterone in the male reproductive system, under the regulation of luteinizing hormone from the pituitary gland.
Step-by-step explanation:
Testosterone Production in the Male Reproductive System:
The part of the male reproductive system responsible for producing testosterone is the testes. Testosterone is a crucial hormone for male development, regulating the production of sperm and the emergence of secondary sexual characteristics.
The Leydig cells within the testes are stimulated by luteinizing hormone (LH) from the pituitary gland, which leads to the secretion of testosterone. This process is vital for both the reproductive and general health of males.