Which of the following structures is responsible for secreting hormones in the male reproductive system?

The testes are the primary structures responsible for the secretion of hormones in the male reproductive system. They have two main functions: the production of sperm and the secretion of hormones, particularly testosterone, which is crucial for the development of male secondary sexual characteristics, regulation of libido, and overall male reproductive function.

While the epididymis is involved in the maturation and storage of sperm, it does not produce hormones. The seminal vesicles contribute fluids that nourish sperm and form a part of the semen, but they do not secrete hormones. The vas deferens is a duct that transports sperm from the epididymis to the ejaculatory duct and does not have a role in hormone production either. Thus, the testes stand out as the key hormone-secreting glands in the male reproductive system.