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Wikipedia about semen

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Internal and external fertilization

Depending on the species, spermatozoa can fertilize ova externally or internally. In external fertilization, the spermatozoa fertilize the ova directly, outside of the female's sexual organs. Female fish, for example, spawn ova into their aquatic environment, where they are fertilized by the semen of the male fish.

During internal fertilization, however, fertilization occurs inside the female's sexual organs. Internal fertilization takes place after insemination of a female by a male through copulation. In low vertebrates (amphibians, reptiles, birds and monotreme mammals), copulation is achieved through the physical mating of the cloaca of the male and female. In marsupial and placental mammals, copulation occurs through the vagina.

Composition of human semen

The components of semen come from two sources: sperm, and "seminal plasma". Seminal plasma, in turn, is produced by contributions from the seminal vesicle, prostate, and bulbourethral glands.

Seminal plasma of humans contains a complex range of organic and inorganic constituents.

The seminal plasma provides a nutritive and protective medium for the spermatozoa during their journey through the female reproductive tract. The normal environment of the vagina is a hostile one for sperm cells, as it is very acidic (from the native microflora producing lactic acid), viscous, and patrolled by immune cells. The components in the seminal plasma attempt to compensate for this hostile environment. Basic amines such as putrescine, spermine, spermidine and cadaverine are responsible for the smell and flavor of semen. These alkaline bases counteract the acidic environment of the vaginal canal, and protect DNA inside the sperm from acidic denaturation.

The components and contributions of semen are as follows:

A 1992 World Health Organization report described normal human semen as having a volume of 2 ml or greater, pH of 7.2 to 8.0, sperm concentration of 20x106 spermatozoa/ml or more, sperm count of 40x106 spermatozoa per ejaculate or more and motility of 50% or more with forward progression (categories a and b) of 25% or more with rapid progression (category a) within 60 minutes of ejaculation.

Appearance and consistency of human semen

Semen2.jpg

Most semen is white in colour, but grey or even yellowish semen can be normal as well. Blood in the semen can cause a pink or reddish colour, known as hematospermia, and may indicate a medical problem which should be evaluated by a doctor if it does not readily disappear.

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News about Semen

Man sentenced in murder of Fresno girl (7:01 a.m.)

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Victim's ex-boyfriend sought by defense at slaying trial

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Man sentenced in murder of Fresno girl

The Fresno BeeA Fresno County judge has sentenced a man to life in prison after prosecutors used DNA evidence to convict him of murdering a 15-year-old girl in 1974. Read comments http://www.fresnobee.com/384/story/911809.html

Plastics in Our Diet: The Need for BPA Regulation

Scientific American Studies have surfaced in recent months that certain plastic products we use every day could be interfering with our hormone systems. Approximately 100,000 synthetic chemicals are approved for consumer products and industrial processes--and certain classes of them, it seems, are dangerous to our health. One compound in the news, known as BPA, is of particular concern. Only a handful of once ...http://www.sciam.com/article.cfm?id=plastics-in-our-diet

Prosecutors: Damm ordered girl's death to derail sex probe

Waterloo-Cedar Falls CourierGALENA, Ill. --- Prosecutors outlined the 2006 sexual abuse probe they allege drove David Damm to order the death of a 13-year-old girl.http://www.wcfcourier.com/articles/2008/10/03/news/metro/106...

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Hannah Foster's blood "found in van of killer"

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Democrat for Allen Alley

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911 Hung Up on Abducted Teen Who Managed to Call Before Her Murder

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Rapaflo Approved for Enlarged Prostate

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Asian Stocks Surge on Government Support Measures; Banks Climb

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Talk:Semen - Wikipedia, the free encyclopedia

SPUNK.....SPERM.....CUM.....WHAT IS IN YOUR MAM'S ASS —Preceding unsigned comment added by 86.2.28.200 03:29, 15 September 2008 (UTC) I think some of the images on this article ... http://en.wikipedia.org/wiki/Talk:Semen

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semen: Definition, Synonyms from Answers.com

semen n. A viscous whitish secretion of the male reproductive organs, containing spermatozoa and consisting of secretions of the testes, seminalhttp://www.answers.com/topic/semen

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Answers for Semen

Mr. Un-couth

What jettisons a male`s semen out the end of his penis and is the force measurable?

Mr. Un-couthIt is a combination of two muscle actions. The contraction of the muscles of the pelvis, and a special kind of muscular action called peristalsis of the urethra. Peristalsis is a wave like contracti...
Frenchboi

What do you do with your semen and fluids after you masturbate?

FrenchboiYou could do it in the shower and then there'd be NO clean up. If you aren't into that then just use an old towel...
Whitehawk

How to increase the amount of semen during ejaculation?

WhitehawkI've heard stories about eating a high protein diet will help. I drink alot of water everyday and my wife says that I drown her when we have sex so you might try that. Also, maybe try the ol' anus m...
BBD

How do I know if my semen has sperm in it?

BBDIf you come is it a transparent fluid? Then there are no sperms in it yet. Does it have a colour:then you make sperm and it is thicker too. Sky
Kitana K

How does seafood affect the taste of semen?

Kitana KGood lord I have no idea... I have heard positive things about pineapple juice though.

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