Sperm is white primarily due to secretions from the prostate gland. These secretions contain enzymes, citric acid, lipids, and acid phosphatase, contributing significantly to the semen's composition and giving it its characteristic color.
Components Contributing to the White Color:
- Prostate Gland Secretions: Approximately 25-30% of semen volume comes from the prostate gland. The components within these secretions cause the white color.
- Sperm Concentration: Although sperm from the testes contributes to semen, its sheer quantity (200-500 million per ejaculation) along with other components contributes to the overall appearance.
- Other Glandular Contributions: Besides the prostate, other glands like the seminal vesicles also add fluids that influence the overall appearance of semen.
Key Components Explained:
- Enzymes: These proteins catalyze biochemical reactions and are essential for sperm function.
- Citric Acid: Contributes to the pH balance and aids sperm motility.
- Lipids: Provide energy for sperm and contribute to the milky appearance.
- Acid Phosphatase: An enzyme with various functions, including potentially affecting sperm capacitation.
Therefore, the combined effect of secretions from the prostate gland, particularly the enzymes, citric acid, lipids, and acid phosphatase, along with the high concentration of sperm, results in the white or greyish-white color of semen.
