The function of the testes is primarily related to which system?

The function of the testes is primarily related to the reproductive system because they are responsible for producing sperm and the hormone testosterone, which plays a crucial role in male sexual development and reproductive functions. The testes contribute to the reproductive system's overall function by creating the gametes necessary for reproduction and regulating a range of physiological processes that contribute to male fertility. Understanding the primary role of the testes helps clarify their importance in the broader context of human reproduction and hormone regulation.