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What is PGs in semen is secreted by and explain in detail?
The seminal vesicles secrete a significant propoion of the fluid that ultimately becomes semen. Lipofuscin granules from dead epithelial cells give the secretion its yellowish color. About 50-70% of the seminal fluid in humans originates from the seminal vesicles, but is not expelled in the first ejaculate fractions which are dominated by spermatozoa and zinc-rich prostatic fluid.Ref: Ganong&;s review of medical physiology; 24th edition; page no:-419