What is the function of the epididymis?

• A. Sperm production
• B. Sperm maturation and storage
• C. Sperm elimination
• D. Sperm locomotion

Answer: (B)

The epididymis is where sperm mature and are stored after being produced in the testes. Sperm that enter the epididymis are immature and non-motile, and as they travel through its duct they undergo maturation — biochemical changes that enable them to swim and to fertilize an egg. They are then stored in the tail of the epididymis until ejaculation, and if not released, they are gradually reabsorbed. This combination of maturation and storage is exactly what the option describes. The other ideas—that sperm are produced there, or that the body eliminates them there, or that the epididymis provides locomotion—don’t fit because production happens in the testes, elimination isn’t a primary epididymal function, and actual movement isn’t generated by the epididymis itself (motility arises after maturation).