What is sperm? the answer is here !

Sperm derived from the Greek term (σπέρμα)'''' sperm (which means "seed") and refers to the reproductive cells of men. In this kind of sexual reproduction known as anisogamy and oogamy, there are marked differences in the size of the gametes with the smaller cell called "male" or sperm.
Human sperm cells are haploid, so that the chromosome 23 can join the 23 chromosomes of a woman's eggs to form diploid cells. A uniflagellar motile sperm cells called spermatozoa, whereas non-motile sperm cells referred to as a spermatium. Sperm cells can not divide and have a limited life span, but after fusion with the egg during fertilization, totipotent zygote is formed with the potential to develop into new organisms. Sperm cells contribute half the genetic information for diploid offspring. In mammals, the sex of offspring is determined by the sperm cells: sperm bearing a Y chromosome will lead to offspring (XY) male, while one bearing an X chromosome will lead to offspring (XX) female (ovum always provides an X chromosome).
Human sperm cells are reproductive cells in men and will only survive in warm environments, once leaving the body and reduced sperm viability can cause cell death, reduced sperm quality. Sperm cells come in two types: "male" and "female". Sperm cells that give rise to female (XX) offspring after fertilization differ in that they carry the X chromosome, while sperm cells that give rise to male (XY) offspring carry a Y chromosome
In the human male, the sperm cells consisting of 5 pM head by 3 pM and 50 pM long tail. The flagelata tail, which pushes the sperm cells (approximately 1-3 mm / min in humans) is sewn in an elliptical cone. Semen has an alkaline nature, and they do not reach full motility (hypermotility) until they reach the vagina where the alkaline pH neutralized by acidic vaginal fluids. Gradual process takes 20-30 minutes. Currently, the fibrinogen from the seminal vesicles forms a clot, securing and protecting the sperm. Just as they become hypermotile, fibrinolysin from the prostate dissolves the clot, allowing the sperm to progress optimally.
Spermatozoa characterized by minimal cytoplasm and the most dense DNA known in eukaryotes. Compared with mitotic chromosomes in somatic cells, sperm DNA at least six times higher viscous.
Spermatozoa to contribute to the DNA / chromatin, centriole and perhaps oocyte-activating factor (stupid). It can also contribute to the father Messenger RNA (mRNA), also contribute to the development of the embryo.
Sperm consists of head, middle and tail sections. Head contains a nucleus with dense chromatin fibers are circular, surrounded by the anterior acrosome, which contains the enzymes used to penetrate the female egg cell. The middle section has a central filamentous core with many revolving around the mitochondria, was used for the production of ATP to travel through the uterus, a woman's cervix and uterine tubes. Tail or "flagellum" executes the movement of the whip that drives spermatocytes.
Spermatozoa of animals produced through spermatogenesis in male gonads (testicles) through meiosis. They were taken out of the male body in a fluid known as semen. Mammalian sperm cells can live up to 3 days inside the female reproductive system.
Sperm were first observed in 1677 by Antonie van Leeuwenhoek used a microscope, he described them as animalcules (small animals), probably because of his belief in preformationism, that although each of which contains that human sperm are fully formed but small.