human female reproductive system
Female Reproductive Organ: Lateral view of cross-sectioned uterus as well as fallopian tubes and ovaries. Every month, an egg is released and drawn into a fallopian tube from one of the two ovaries. If fertilization occurs, the egg moves down the fallopian tube and implants itself in the wall of the uterus, a pear-shaped, hollow, muscular organ that will grow and expand to support a developing baby. If the egg is not fertilized, the egg and uterine lining are shed during menstruation, and will pass out of the uterus through the cervix to the muscular vagina, and out of the body.
The female reproductive system (or female genital system) contains two main parts: the uterus, which hosts the developing fetus, produces vaginal and uterine secretions, and passes the male's sperm through to the fallopian tubes; and the ovaries, which produce the female's egg cells. These parts are internal; the vagina meets the external organs at the vulva, which includes the labia, clitoris and urethra. The vagina is attached to the uterus through the cervix, while the uterus is attached to the ovaries via the Fallopian tubes. At certain intervals, the ovaries release an ovum, which passes through the Fallopian tube into the uterus. If, in this transit, it meets with sperm, the sperm penetrate and merge with the egg, fertilizing it. Corresponding equivalent among males is the male reproductive system.
During the reproductive process, the egg releases certain molecules that are essential to guiding the sperm and these allow the surface of the egg to attach to the sperm's surface then the egg can absorb the sperm and fertilization begins. The fertilization usually occurs in the oviducts, but can happen in the uterus itself. The zygote then implants itself in the wall of the uterus, where it begins the processes of embryogenesis and morphogenesis. When developed enough to survive outside the womb, the cervix dilates and contractions of the uterus propel the fetus through the birth canal, which is the vagina.
The ova are larger than sperm and have formed by the time a female is born. Approximately every month, a process of oogenesis matures one ovum to be sent down the Fallopian tube attached to its ovary in anticipation of fertilization. If not fertilized, this egg is flushed out of the system through menstruation.
- ^ Freedman, David H. (1992). “The Aggressive Egg”in DISCOVER. Biology & Medicine.
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