Final answer:
The prostate gland is a chestnut-sized organ in males that secretes an alkaline, milky fluid into semen, facilitating the transport and nourishment of sperm.
Step-by-step explanation:
The gland refaerred to in the student's question is the prostate gland. This walnut-sized organ is located in the male reproductive system, where it surrounds part of the urethra and sits at the base of the bladder. It is composed of both muscular and glandular tissues, which contributes to its function during ejaculation. The prostate gland produces a milky, alkaline fluid that constitutes about 30 percent of semen volume. This fluid serves several important functions, including the coagulation and subsequent decoagulation of semen, making it temporarily thicker to remain within the female reproductive trct, thereby giving sperm time to utilize nutrients provided by seminal vesicle secretions. The semen also contains prostate specific antigen (PSA), which is vital for liquefying the ejaculate to enable sperm mobility.