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But there's one exception. Sperm start out looking pretty much like any cell in the body. Craig Niederberger , professor of urology at the University of Illinois at Chicago. Lucky for them and us , sperm get the fuel they need in the form of sugar fructose, which is supplied by the seminal vesicles. If a guy loses one testicle, the other is generally able to make enough sperm to create a baby. He has fathered five children since then, three from banked sperm, but two, he says, were concieved naturally. How long can a sperm cell live once inside a woman's body.

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Women are born with all the eggs they'll ever have. In fact, the average ejaculate contains million sperm. Some want to buy or sell them. Ever seen salmon swim upstream. Two heads, two tails, huge heads, pinheads, coiled tails - the list of common deformities is a long one. Human sperm-making machinery is a bit lazy. The only thing that matters is the DNA inside the sperm.

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Two heads, two tails, huge heads, pinheads, coiled tails - the list of common deformities is a long one. To fertilize an egg the old-fashioned way, sperm need to be able to swim. If a guy could coax all the sperm in one ejaculate to line up end to end, they'd stretch six miles. Ditto if he wears briefs. That's how much a man typically ejaculates.

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Description: Of course, what sperm lack in size they more than make up in sheer numbers. About two months, according to the latest studies. How long does it take to make sperm. How else to explain the fact that 90 percent of the sperm in a man's ejaculate are deformed. Once a sperm fuses with an egg, the chromosomes swap bits of DNA, meaning that each becomes a mash-up of mom's and dad's DNA. To keep immune cells from wiping out "invading" sperm, the testicles employ specialized cells to surround them with a sort of "picket fence.
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