What is the function of the ductus deferens in the male reproductive system?

The ductus deferens, also known as the vas deferens, plays a crucial role in the male reproductive system by transporting sperm from the epididymis to the ejaculatory duct. After sperm is produced in the testes, it matures and is stored in the epididymis until ejaculation. During ejaculation, muscular contractions of the ductus deferens propel the sperm through this tube to mix with seminal fluid within the seminal vesicles and prostate, ultimately forming semen. This transportation function is vital for effective reproduction, as it ensures sperm reach the urethra for expulsion during ejaculation.

The other options refer to different components or activities within the male reproductive system. The production of testosterone is primarily the function of the testes, while the secretion of seminal fluid involves the seminal vesicles and prostate gland. Nourishing spermatozoa is typically associated with the role of the seminal fluid rather than the ductus deferens itself.