What is the primary role of the seminal vesicle?

The primary role of the seminal vesicle is to secrete seminal fluid, which plays a crucial part in human reproduction. This fluid is rich in sugars, particularly fructose, which provides an energy source for sperm cells, facilitating their motility and viability once they enter the female reproductive system. The seminal vesicle contributes to the formation of semen when the seminal fluid combines with sperm from the testes and other fluids from the prostate gland and bulbourethral glands. This process is essential for producing a medium that not only protects the sperm but also nourishes them during their journey to fertilize an egg.

In contrast, the production of sperm occurs in the testes, and while the seminal vesicle is involved in the transportation of semen during ejaculation, its main function is the secretion of fluids that make up a significant part of the semen. Storage of urine is not associated with the seminal vesicle, as urine is held in the bladder and has no relation to the reproductive processes involving the seminal vesicle.