What is the main role of the seminal vesicles?

The seminal vesicles are primarily responsible for secreting a fluid that contributes to the composition of semen. This fluid contains various substances, including fructose, which provides energy for the sperm, as well as proteins, enzymes, and other compounds that facilitate sperm motility and viability once they are ejaculated. The secretions from the seminal vesicles constitute a significant portion of the total volume of semen, highlighting their crucial role in reproduction.

While sperm production occurs in the testes and sperm transport is managed by structures like the vas deferens, the seminal vesicles specifically focus on creating the environment in which sperm can thrive, ensuring their successful journey during fertilization. Hormone regulation primarily involves the endocrine system and various glands, but not directly through the function of the seminal vesicles. Thus, identifying their main role as the secretion of fluid essential for semen composition is accurate and underscores their importance in male reproductive health.