Which gland accounts for about 30% of semen volume?

Which gland accounts for about 30% of semen volume?

• A. Seminal vesicles
• B. Bulbourethral glands
• C. Testes
• D. Prostate gland

Answer: (D)

Semen is made from fluids produced by several glands, and each adds a characteristic component. The prostate gland contributes a substantial portion of semen, producing prostatic fluid that is alkaline and rich in substances like citrate and enzymes (including PSA). This fluid helps buffer the acidic vaginal environment, providing nutrients and factors that support sperm vitality and function. After ejaculation, enzymes in the prostatic fluid also help liquefy the initial semen clot, enabling sperm to swim more freely. This combination of buffering, nourishment, and activation explains why the prostate accounts for about 30% of semen volume. The seminal vesicles provide the largest share with sugary energy supply (fructose) and prostaglandins, while bulbourethral glands contribute a smaller amount of lubricating mucus, and the testes supply the sperm themselves.

Semen is made from fluids produced by several glands, and each adds a characteristic component. The prostate gland contributes a substantial portion of semen, producing prostatic fluid that is alkaline and rich in substances like citrate and enzymes (including PSA). This fluid helps buffer the acidic vaginal environment, providing nutrients and factors that support sperm vitality and function. After ejaculation, enzymes in the prostatic fluid also help liquefy the initial semen clot, enabling sperm to swim more freely. This combination of buffering, nourishment, and activation explains why the prostate accounts for about 30% of semen volume. The seminal vesicles provide the largest share with sugary energy supply (fructose) and prostaglandins, while bulbourethral glands contribute a smaller amount of lubricating mucus, and the testes supply the sperm themselves.