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The female reproductive system likewise contains two main divisions: the external genitalia (the [[Human vulva|vulva]]) and the internal genitalia.
The [[Egg cell|ovum]] meets with the [[sperm cell]]: a sperm may penetrate and merge with the egg, fertilizing it with the help of certain hydrolytic enzymes present in the acrosome. The fertilization usually occurs in the [[fallopian tube]]s, but can happen in the uterus itself. The [[zygote]] then becomes [[Implantation (human embryo)|implanted]] in the lining of the uterus, where it begins the processes of [[embryogenesis]] and [[morphogenesis]]. When the [[fetus]] is developed enough to survive outside of the [[uterus]], the cervix dilates and contractions of the uterus propel it through the birth canal, which is the [[Human vagina|vagina]], and thereby gives external life to the newborn [[infant]]. This process is called [[childbirth]].
The ova, which are the female sex cells, are much larger than the spermatozoon and are normally formed within the [[Ovary|ovaries]] of the female fetus before birth. They are mostly fixed in location within the ovary until their transit to the uterus, and contain nutrients for the later [[zygote]] and [[embryo]]. Over a regular interval known as the [[menstrual cycle]], in response to hormonal signals, a process of [[oogenesis]] matures one ovum which is released and sent down the fallopian tube. If not fertilized, this egg is flushed out of the system through [[menstruation]].
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