Final answer:
The testes are the structures that produce sperm within the male reproductive system. After sperm are produced in the testes, they mature in the epididymis and are later expelled as part of semen during ejaculation.
Step-by-step explanation:
The male reproductive system includes several structures, but when it comes to the production of sperm, the testes are the primary site. Within the testes are highly coiled tubes called seminiferous tubules where the development of sperm occurs. The process of sperm production, known as spermatogenesis, happens within these structures. After production, the sperm are transported to the epididymis where they undergo maturation and storage.
The epididymis, located atop each testis, is a coiled tube that plays a crucial role in the maturation and storage of sperm post-production. Eventually, during ejaculation, sperm travel from the epididymis through the vas deferens, mix with fluids from the seminal vesicles and prostate gland to form semen.