The age of viability is: the age at which the fetus can, with specialized medical care, survive outside the womb.
Approximately 14 days following the last menstrual period, one egg (or ovum) is typically released from one of the ovaries during each normal menstrual cycle. Ovulation is the process of the egg's release. One of the fallopian tubes' funnel-shaped end receives the egg. The cervix's mucus changes during ovulation, becoming more elastic and fluid, which enables sperm to enter the uterus quickly. Sperm can travel from the vagina, through the cervix and uterus to the funnel-shaped end of a fallopian tube—the typical location of fertilization—in as little as five minutes. Fertilization is made easier by the cells that line the fallopian tube.
The egg travels down the fallopian tube to the uterus if fertilisation is unsuccessful, where it degenerates and is passed through the uterus during the subsequent menstrual cycle. A sperm can fertilise an egg by penetrating it. The fallopian tube's cilia, which resemble tiny hairs, help the fertilised egg (zygote) move through the tube and reach the uterus. As the zygote travels through the fallopian tube to the uterus, its cells continue to divide. In 3 to 5 days, the zygote enters the uterus.
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