Final answer:
Sperm mature in the testes and travel to the epididymis, then move through the vas deferens to the ejaculatory duct where they mix with fluids to form semen. The semen passes through the prostate, joining more fluids, and is ejaculated through the urethra out of the body. A vasectomy prevents sperm from exiting the body.
Step-by-step explanation:
The route of sperm and semen through the male reproductive system begins with the sperm's development in the testes. Once mature, sperm move to the epididymis where they complete their maturation process. They then travel through the vas deferens to the ejaculatory duct, where fluids from the seminal vesicles are added to form semen. This mixture passes behind the bladder and through the prostate gland, where additional fluids are incorporated.
Finally, the semen, containing the sperm, is ejaculated out of the body via the urethra through the p*nis. After leaving the ejaculatory duct, the sperm, now part of the semen, are deposited in the urethra awaiting ejaculation.
Ejaculation propels sperm from the epididymis through the ducts with muscular contractions, and the addition of fluids from the glands creates semen. With each ejaculation, hundreds of millions of sperm are released. A vasectomy, which involves the removal of a section of the vas deferens, prevents these sperm from being expelled from the body and hence prevents fertilization.