Semen contains secretions or products from
Seminal vesicle
Prostate gland
Seminferous tubules
Bulbourethral gland
All of the above
The correct answer and explanation is:
Correct Answer: All of the above
Explanation (Approximately 300 words):
Semen is a complex mixture of fluids and cells that plays a crucial role in reproduction. It is composed of secretions from multiple male reproductive organs, each contributing different components essential for the survival, nourishment, and transport of sperm.
- Seminal Vesicle:
The seminal vesicles contribute about 60% of the total volume of semen. Their secretion is rich in fructose, which provides energy for the sperm, as well as prostaglandins that help in stimulating contractions in the female reproductive tract to aid sperm movement. It also contains proteins and enzymes that enhance sperm motility and viability. - Prostate Gland:
The prostate gland adds approximately 25–30% of the semen volume. It secretes a milky, slightly alkaline fluid that helps neutralize the acidic environment of the vagina, increasing sperm lifespan. The prostatic fluid also contains enzymes, citric acid, and zinc, all of which support sperm function. - Seminiferous Tubules:
Located within the testes, seminiferous tubules are the site of spermatogenesis — the production of sperm cells. Although they don’t secrete fluid into semen directly, they are essential as they produce the spermatozoa, which are the functional reproductive cells in semen. - Bulbourethral Gland (Cowper’s Gland):
These glands secrete a clear, mucus-like fluid that lubricates the urethra and neutralizes traces of acidic urine before ejaculation. While the amount is small, it is a component of semen and helps facilitate the smooth passage of sperm.
In conclusion, semen is not the product of a single gland but a combined secretion from multiple sources: the seminal vesicles, prostate gland, seminiferous tubules, and bulbourethral glands. Each plays a specific and vital role, making “All of the above” the correct answer.