Where do gametes mature and are stored in the male reproductive system?

The epididymis is indeed the correct answer as it is the site where sperm, the male gametes, mature and are stored. After sperm are produced in the testes, they enter the epididymis, a coiled tube located at the back of each testis. It is within the epididymis that sperm undergo a significant maturation process, acquiring the motility and ability to fertilize an egg.

Additionally, once sperm are fully mature, they are stored in the epididymis until ejaculation. This long tube allows for the effective storage and transit of sperm, ensuring they remain viable until they need to be released during sexual intercourse.

The other options refer to different parts of the male reproductive system: the vas deferens is primarily a transport duct for sperm from the epididymis to the ejaculatory duct; the seminal vesicles are glands that contribute fluid to semen but are not involved in the maturation of sperm; and the testes are where sperm production occurs but not where they mature. This knowledge helps clarify the distinct roles each component plays in male reproduction.