The ovaries produce the female egg cells, called the ova or oocytes. The oocytes are transported through the fallopian tubes and there is where Conception, the fertilization of an egg by a sperm, happens. The fertilized egg then moves to the uterus. Because of the hormones of the reproductive cycle the uterine lining has thickened and the fertilized egg can implant into thickened uterine lining and continue to develop.