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As sperm enter the urethra, the seminal vesicles, prostate gland, and Cowper âs glands all secrete fluids into the urethra. 3 5 Sperm, Cont âd 5. These fluids nourish the sperm and protect them from the acidity of the female reproductive tract6. Semen is the mixture of sperm and fluids7. Involuntary contractions of the muscles force the semen through the urethra, and out of the body in a process called ejaculation 6 Seminal Vesicles 1. Active secretory gland2.
During the process of ejaculation, sperm passes through the ejaculatory ducts and mixes with fluids from the seminal vesicles, the prostate, and the bulbourethral glands to form the semen. The seminal vesicles produce a yellowish viscous fluid rich in fructose and other substances that makes up about 70% of human semen.The prostatic secretion, influenced by dihydrotestosterone, is a whitish (sometimes clear), thin fluid containing proteolytic enzymes, citric acid, acid phosphatase and lipids.emen is produced and originates from the seminal vesicle, which is located in the pelvis. The process that results in the discharge of semen is called ejaculation.