Final answer:
The prostate gland is responsible for producing fluids that mix with sperm to create semen. This gland is an essential part of the male reproductive system and works alongside the seminal vesicles and bulbourethral glands to contribute to the volume and composition of semen.
Step-by-step explanation:
The gland that functions to produce fluid secretions that are added to sperm to create semen is the prostate gland. Besides the prostate, the seminal vesicles and the bulbourethral glands also contribute to the semen volume and composition. The prostate gland provides substances that are critical to sperm maturation and survival. Contrary to one potential misconception, the prostate gland is not located in the testes. Instead, it is situated near the bladder and surrounds the urethra in males.
Sperm are produced in the seminiferous tubules located within the testes. Then, during ejaculation, the sperm travel through the vas deferens to the ejaculatory duct, which joins the urethra. The prostate gland, along with the seminal vesicles and bulbourethral glands, release fluids that mix with the sperm to form semen, which is then transported during ejaculation.