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Semen
nSeminal fluid from the
accessory glands combines with sperm from the testes to make up semen.
nWhen released during
intercourse, semen is called the ejaculate, and it is normally about 3 to 5 milliliters in volume and contains approximately
200 to 500
million spermatozoa.
nIn a sexually active
male, the average transit time of human spermatozoa—from their release into the lumen of the seminiferous tubules, passage through the duct system,
and appearance in the
ejaculate—is about 2 weeks.
nSince semen is
composed primarily of seminal fluid, a male who is very active sexually may
have a reduced
sperm count because there are fewer sperm to be released from the epididymis; however, the total semen volume remains close to normal for that individual.