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Fertilization - Definition

Fertilization means a fundamental step in sexual reproduction in which the male gamete fuses with the female gamete to form the egg, called the zygote. In humans, the sperm plays the role of the male gamete and the egg is the female gamete. The spermatozoa in the semen emitted in the woman's vagina will come into contact with the egg, and one of them will penetrate the egg.

After penetration, the oocyte will be "sealed" to the entry of other spermatozoa, allowing the development of a single egg.

When the fertilization can not be natural, can be practiced in vitro fertilization, which involves the formation of an egg outside the woman's body, and then secondarily transferred into her uterus.