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Encyclopedia > Sperm count

The sperm count is a measure of fertility in a man. It is the number of sperm in a unit volume of semen. A normal sperm count is between 20 million and 150 million sperm per millilitre [1]. A sperm count below 20 million sperm per millilitre is low and may indicate a fertility problem. [2]. Fertility is the ability of people or animals to produce healthy offspring in abundance. ... A man is a male human. ... The signifier sperm can refer to: (mass noun, from Greek sperma = seed) a substance which consists of spermatozoa and which is a component of semen (mass noun) semen itself (informally, count noun with plural sperm or sperms) a single spermatozoon (= sperm cell) sperma ceti (Latin ceti, genitive of cetus = whale... Human semen Horse semen being collected for breeding purposes. ... The millilitre is the equivalent of a cubic centimetre. ... Infertility is the inability to naturally conceive a child or to carry a pregnancy to full term. ...

Having a man's sperm count measured is a common method for diagnosing problems in couples experiencing fertility problems. It is important to note that if a man's sperm count is less than the normal range, it is still possible to father a child. The sperm count depends on how long ago the man last had an orgasm. It has been suggested that Dry orgasm be merged into this article or section. ...

As well, exposing the scrotum and testes to extreme heat and cold — temperatures outside the range of optimal sperm production — can kill sperm quickly and lower sperm count to zero. In some male mammals, the scrotum is a bag of skin and muscle containing the testicles. ... Human male anatomy The testicles, known medically as testes (singular testis), are the male generative glands in animals. ...

External links

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  Results from FactBites:
Our Stolen Future: Emerging science on sperm maladies (2357 words)
The authors measured sperm count in male patients at an infertility clinic over a three year time period (1994-97) and compared their results with data from 1951.
Sperm concentrations dropped at a rate of 2.1 percent a year with year of birth.
In particular, we have observed a decline in sperm concentration and the total number of sperm and of motile sperm in the ejaculate in association with a later year of birth, such that men born in the 1970s are producing some 24% fewer motile sperm in their ejaculate than are men born in the 1950s."
Aggression and Sperm Count Issues (7719 words)
This is because sperm are hardy and may survive in the vagina of a chimpanzee or woman for as long as eight or nine days.
Favoring the sperm of one male over that of competitors are such things as position during intercourse, force and timing of pervic thrusting, number and speed to ejaculated sperm, and proximity of the spermatic means of delivery---the penis---to the egg at time of ejacultion.
Under condiditions of "runaway sperm competition", neophilia and female promiscuity, combined with elaborated estral swellings, facilitate sperm competition within female reproductive tract around the time of ovulation, thereby increasing the likelihood of females having male offspring with large testicles, high sperm counts, and high sperm motility.
  More results at FactBites »



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