Final answer:
Sperm are produced in the seminiferous tubules in the testes.
Step-by-step explanation:
The region of the testis that produces sperm is called the seminiferous tubules. These tubules are located in the testes and are filled with hundreds of tiny, tightly coiled structures where sperm are produced. Spermatogenesis, the process of sperm production, occurs within these seminiferous tubules.