Reproductive System Gametogenesis Ovarian & Menstrual Cycle Hormonal control Preganancy:Human

Reproductive System Gametogenesis Ovarian & Menstrual Cycle Hormonal control Preganancy:Human Embryology The average menstrual cycle lasts 28 days, with the cycle's first day considered to be the first day of menstruation. During the first 14 days of the cycle, an egg matures in a woman's ovaries. This maturation process is stimulated by a hormone called follicle stimulating hormone (FSH).Human reproductive system, organ system by which humans reproduce and bear live offspring. Provided all organs are present, normally constructed, and functioning properly, the essential features of human reproduction are (1) liberation of an ovum, or egg, at a specific time in the reproductive cycle, (2) internal fertilization of the ovum by spermatozoa, or sperm cells, (3) transport of the fertilized ovum to the uterus, or womb, (4) implantation of the blastocyst, the early embryo developed from the fertilized ovum, in the wall of the uterus, (5) formation of a placenta and maintenance of the unborn child during the entire period of gestation, (6) birth of the child and expulsion of the placenta, and (7) suckling and care of the child, with an eventual return of the maternal organs to virtually their original state.