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Menstrual cycle The menstrual cycle is a series of natural changes in hormone production and the structures of the uterus and ovaries of the female reproductive system that makes pregnancy possible. The ovarian cycle controls the production and release of eggs and the cyclic release of estrogen and progesterone. The uterine cycle governs the preparation and maintenance of the lining of the ...
The “fertile window” spans the six days preceding ovulation and ends on the day of ovulation. Women tend to have a specific change in the look and volume of cervical mucus at this time.
Ovulation is the point in your menstrual cycle where your body releases an egg, which may then become fertilized, leading to pregnancy. It normally occurs about halfway through your menstrual cycle.
Ovulation is an important part of the menstrual cycle in female vertebrates where the egg cells are released from the ovaries as part of the ovarian cycle. In female humans ovulation typically occurs near the midpoint in the menstrual cycle and after the follicular phase. Ovulation is stimulated by an increase in luteinizing hormone (LH).
The average age of a girl's first period is 12 to 13 (12.5 years in the United States, [6] 12.72 in Canada, [7] 12.9 in the UK [8]) but, in postmenarchal girls, about 80% of the cycles are anovulatory in the first year after menarche, which declines to 50% in the third year, and to 10% by the sixth. [9]
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Without ovulation, she may enter interestrus, which is the combined stages of diestrus and anestrus, before reentering estrus. With the induction of ovulation, the female becomes pregnant or undergoes a non-pregnant luteal phase, also known as pseudopregnancy. Cats are polyestrous but experience a seasonal anestrus in autumn and late winter. [19]
The luteal body increases the concentration of progesterone, which LH constantly stimulates. If the egg is not fertilized, the corpus luteum degenerates (body albicans); if it is implanted, it remains until three months of pregnancy, where its function is replaced by the placenta (production of progesterone
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