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Puberty - The arrival of the monthly friend.
The principle sign that a girl has become sexually mature and is capable of reproduction is the onset of menstruation, a period of cyclic bleeding from the vagina. (Smith 1997, pg 217) This is one of the key physiological functions of the female body. An ovarian, or estrus, cycle is characteristic of all female mammals, but menstruation, p ....
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.... phase at midcycle, the ovum is released as LH production surges and FSH output decreases. Gonadotropic hormones that control the output of ovarian hormones are in turn regulated by the level of ovarian hormones through a negative feedback mechanism. Thus, the increased level of estrogens depresses FSH production. Following ovulation, the follicle transforms into the corpus luteum ("yellow body") which produces progesterone. Around ovulation, some women feel a twinge or cramp i ....
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