Life science sperm
Mike Leahy - writing with Hilary McQueen - gets to grips with the numbers behind the man's part of the reproductive system - sperm. Although I'm a biologist, I rarely think much about what the cloudy white stuff contains, but in fact semen is far more complex than my endearing childhood image of mini tadpoles swimming around in thin wallpaper paste. There are many features of human semen that are very familiar to most people, but their importance isn't appreciated. For a start, the ejaculate isn't of a uniform consistency. As the man ejaculates, the first 'spurt' contains far more sperm than subsequent spurts. This is why the withdrawal method of contraception is so dangerous.
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NCBI Bookshelf. Molecular Biology of the Cell. New York: Garland Science;
Males produce millions of these cells each day, yet it takes only one to fertilize an egg and create a life. This article outlines what sperm are, where they originate, and the factors affecting their ability to fertilize an egg. Sperm is the male reproductive cell or gamete. When a sperm combines with a female gamete, or egg, it results in a human embryo. When studying a sperm cell under a microscope, scientists can typically identify the following three parts:.