Gland (s) Approximate fraction Description testes 2 -- 5 % Approximately 200 - to 500 - million spermatozoa (also called sperm or spermatozoans), produced in the testes, are released per ejaculation. If a man has undergone a vasectomy, he will have no sperm in the ejaculation. seminal vesicles 65 -- 75 % amino acids, citrate, enzymes, flavins, fructose (2 -- 5 mg per mL semen, the main energy source of sperm cells, which rely entirely on sugars from the seminal plasma for energy), phosphorylcholine, prostaglandins (involved in suppressing an immune response by the female against the foreign semen), proteins, vitamin C prostate 25 -- 30 % acid phosphatase, citric acid, fibrinolysin, prostate specific antigen, proteolytic enzymes, zinc (the zinc level is about 135 ± 40 micrograms / ml for healthy men. Zinc serves to help to stabilize the DNA - containing chromatin in the sperm cells. A zinc deficiency may result in lowered fertility because of increased sperm fragility. Zinc deficiency can also adversely affect spermatogenesis.) bulbourethral glands < 1 % galactose, mucus (serve to increase the mobility of sperm cells in the vagina and cervix by creating a less viscous channel for the sperm cells to swim through, and preventing their diffusion out of the semen. Contributes to the cohesive jelly - like texture of semen.), pre-ejaculate, sialic acid
why does seminal fluid have a high content of​ sugar
the main energy source of sperm cells, which rely entirely on sugars from the seminal plasma for energy), phosphorylcholine, prostaglandins (involved in suppressing an immune response by the female against the foreign semen), proteins, vitamin C