Final answer:
Sperm mature in the epididymis and are then transported through the vas deferens to form semen with glandular secretions. This semen exits the body through the urethra during ejaculation.
Step-by-step explanation:
The male reproductive system is designed to transport sperm from the point of their creation to where they are deposited during ejaculation. When sperm are nearly mature, they leave the testicles and enter the epididymis, where they finish maturing. Upon leaving the epididymis, sperm travel through the vas deferens, behind the bladder, and form the ejaculatory duct with the duct from the seminal vesicles. During ejaculation, sperm are propelled by muscle contractions from the epididymis through the ducts, mixing with fluids from the glands to become semen. This semen now containing hundreds of millions of sperm exits the body through the urethra. Sperm deposited after leaving the ejaculatory duct is part of this semen, which is released during ejaculation and contains both sperm and glandular secretions.