What is the primary function of the testes in the male reproductive system?

The primary function of the testes in the male reproductive system is the production of sperm and hormones. The testes are essential for male fertility as they are the sites where spermatogenesis occurs, a process that leads to the formation of sperm cells. Additionally, the testes produce testosterone, which plays a crucial role in the development of male secondary sexual characteristics and influences various aspects of male health, such as libido and muscle mass.

This dual role of sperm and hormone production is pivotal for reproductive and overall health in males. While the storage of mature sperm occurs in the epididymis, and fluids for ejaculation are secreted by accessory glands like the seminal vesicles and prostate, these functions are secondary to the primary roles of the testes. Transport of sperm is also managed by other structures, such as the vas deferens, further highlighting that the main responsibilities lie within the testes themselves.