nSeminal fluid from the
accessory glands combines with spermfrom 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
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 countbecause there are fewer sperm to be released from the epididymis; however, the total semen volume remains close to normal for that individual.