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Alternate titles: spermatozoa, spermatozoan, spermatozoon sperm, also called spermatozoon, plural spermatozoa, male reproductive cell, produced by most animals . With the exception of nematode worms, decapods (e .g ., crayfish), diplopods (e .g ., millipedes), and mites, sperm are flagellated; that is, they have a whiplike tail . In higher vertebrates, especially mammals, sperm are produced in the testes . The sperm unites with (fertilizes) an ovum (egg) of the female to produce a new offspring . Mature sperm have two distinguishable parts, a head and a tail . The head of the sperm varies in shape for each animal species . In humans it is flattened and almond-shaped, four to five micrometres long and two to three micrometres wide (there are about 25,000 micrometres in an inch) . The head portion is mainly a cell nucleus; it consists of genetic substances, called chromosomes, which are responsible for transmitting specific characteristics of an individual, such as the colour of eyes, hair, and skin . In each body cell of healthy humans, there are 46 chromosomes, which are responsible for the individual’s general physical makeup . The sperm cells have only 23 chromosomes, or half of the usual number . When a sperm cell unites with the ovum, which also has 23 chromosomes, the resulting 46 chromosomes determine the offspring’s characteristics . The sperm cells also carry the X or Y chromosome that determines the sex of the future child . How deep is your body of knowledge about the inner workings of humans? Test it with this quiz . Covering the head of the sperm is a cap known as the acrosome, which contains enzymes that help sperm to enter an egg . Only one sperm fertilizes each egg, even though 300,000,000 to 400,000,000 sperm are contained in an average ejaculation . Each egg and sperm produced has slightly different genetic information carried in the chromosomes; this accounts for the differences and similarities between children of the same parents . A small middle portion of the sperm contains the mitochondria . The tail of the sperm, sometimes called the flagellum, is a slender, hairlike bundle of filaments that connects to the head and middle portion . The tail is about 50 micrometres long; its thickness of one micrometre near the mitochondria gradually diminishes to less than one-half micrometre at the end of the tail . The tail gives the sperm cell movement . It whips and undulates so that the cell can travel to the egg . Following sperm deposition in the female reproductive tract, activation of tail movement is suppressed until the sperm is carried to within a relatively short distance of the egg . This gives the sperm an increased chance of reaching the egg before exhausting its energy supplies . The activation of tail movements is part of the process of capacitation, in which the sperm undergoes a series of cellular changes that enables its participation in fertilization . A fundamental change that occurs during capacitation is alkalinization of sperm cytoplasm, in which the intracellular pH levels increase, particularly in the flagellum . This process, which is driven by the rapid movement of protons out of the cell through ion channels on the flagellum, underlies tail activation . Proton channels on sperm flagella are primed for opening by the presence in the female reproductive tract of a substance known as anandamide, which is thought to occur in high concentrations near the egg . Upon reaching an egg, enzymes contained within the sperm acrosome are activated, enabling the sperm to traverse the thick coat surrounding the egg (the zona pellucida); this process is known as the acrosome reaction . The membrane of the sperm cell then fuses with that of the egg, and the sperm nucleus is conveyed into the egg . Sperm deposited in the reproductive tract of the female that do not reach the egg die . Sperm cells may live in the human body for two or three days after mating . Sperm may also be stored in a frozen state for months or years and still retain their capacity to fertilize eggs when thawe
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