Reproduction is the process by which organisms make more organisms like themselves. But even though the reproductive system is essential to keeping a species alive, unlike other body systems, it's not essential to keeping an individual alive. In the human reproductive process, two kinds of sex cells, or gametes pronounced: GAH-meetz , are involved. The male gamete, or sperm, and the female gamete, the egg or ovum, meet in the female's reproductive system.
Hormones secreted by the ovaries and a small gland in the brain called the pituitary gland control the menstrual cycle. The average menstrual cycle is around 28 days. After a period, rising levels of the hormone oestrogen help to thicken the lining of the womb the endometrium. At mid-cycle, an egg is released from one of the ovaries ovulation. If the egg is fertilised on its journey down the fallopian tube, it lodges in the womb lining. If the egg is unfertilised, falling levels of the hormone progesterone make the womb lining come away.
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When a child's gender is not clear at birth, the child has atypical genitalia ambiguous genitalia. This means that the genitals don't seem to be clearly male or female. You have 46 chromosomes in each cell of your body.