jueves, 3 de febrero de 2011

Human Reproduction

The humans reproduce by the sexual reproduction, the sexual reproduction is when a pair of persons men and woman unit and have sex relationships to have a baby , During intercourse, the interaction between the male reproductive system and the female reproductive system results in fertilization of the woman's ovum by the man's sperm.

The male reproductive system contains two main divisions: the penis, and the testes, the latter of which is where sperm are produced.Male anatomy en.svg

The female reproductive system likewise contains two main divisions: the vagina and uterus, which act as the receptacle for the semen, and the ovaries, which produce the female's ova. 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.Scheme female reproductive system-en.svg

If, in this transit, it meets with Spermatozoon, the sperm penetrate and merge with the egg, fertilizing it. 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 sexual reproduction is most bigger and most strong than the male reproduction

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