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Human reproduction is the reproduction of humans. It is a form of sexual reproduction, by sexual intercourse between human males and females. In the sexual intercourse, interaction between the male reproductive system and the female reproductive system results in pregnancy, which is followed by childbirth The male reproductive system contains two main divisions the penis, and the testes, the latter of which is where sperm are produced. In humans, both of these organs are outside the abdominal cavity. Having the testes outside the abdomen best facilitates temperature regulation of the sperm, which require specific temperatures to survive. Sperm are the smaller than the female ovum, and live approximately 2 weeks after production, requiring males to produce them continuously from the time of sexual maturity until death. Prior to ejaculation the produced sperm are stored in the seminal vesicle, a small gland that is located just behind the bladder.
A sperm cell is motile and swims via chemotaxis, using its flagellum to propel itself towards the ovum. The female reproductive system likewise contains two main divisions the vagina and uterus, which act as the receptacle for the sperm, 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.
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