Final answer:
The seminal vesicles join the vas deferens to form the ejaculatory ducts, which transport sperm and seminal fluid to the urethra as a part of semen.
Step-by-step explanation:
Glands called seminal vesicles join the final portion of the vas deferens to form the ejaculatory ducts. The ejaculatory ducts serve as a pathway for sperm, combining secretions from the seminal vesicles and the prostate gland, thus forming semen. The fluid from the seminal vesicles is alkaline, helping to neutralize the acidity of the female reproductive tract and enabling sperm mobility and survival. In addition, this fluid from the seminal vesicles includes fructose, which provides the energy needed for sperm movement.