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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.
Clear semen may not be semen at all, but  pre-seminal fluid which may contain few sperm cells. Seminal fluid  is the off-whitish fluid that contains many sperm cells and is the  constituent for which conception of offspring, if intercourse is  successful, is achieved.uring ejaculation, liquids from the prostate gland & seminal vesicles dilute the sperm & provide a suitable, slightly alkaline environment. An average ejaculation of a human male expels 0.1 to 0.3 cubic inches (2 to 5 ml.), containing 200 to 300 million sperm.