Which gland is responsible for secreting seminal fluid?

The prostate gland is primarily responsible for secreting seminal fluid, which plays a crucial role in male reproductive health. It produces a fluid that nourishes and transports sperm during ejaculation. This prostatic fluid constitutes a significant portion of semen, and it helps to neutralize the acidity of the vaginal tract, providing a more favorable environment for sperm survival.

In contrast, the bulbourethral glands do contribute a small amount of fluid to the semen but are not the primary source of seminal fluid. The thyroid gland is involved in regulating metabolism and energy production, rather than reproductive functions. The adrenal glands produce hormones that are involved in stress response and metabolism but do not have a role in semen production. Thus, the prostate gland is recognized for its vital function in creating seminal fluid, making it the correct choice in this context.