Why female seed to ＂period＂ also called the ＂N＂?

Menstruation is a woman's normal physiological phenomenon. In general, women of reproductive age, during pregnancy and lactation period, we have a period.
period is the formation of long-term evolutionary process. Pregnant mother needs to prepare.

adolescent female sex hormone secretion of ovarian function due to cyclical changes in endometrial place, once a month off, shedding the blood via the vaginal mucosa and excreted, this bloodshed is menstruation.
sanitary napkin is a strong absorbent material, the main material for the cotton-like pulp and polymer absorber used to absorb the female menstrual cramps, blood flowing from the vagina.
1550 BC, in Egypt has put a soft cloth into the vagina to prevent pregnancy records, experts concluded that these soft cloth is also used to deal with menstruation, it is probably all we can know that the first generation of "sanitary napkin "the.
modern version of the sanitary napkin is said to love his wife by a U.S. men's invention, he stumbled: The valuables of the cloth will be clean and absorbent cotton fiber pulp wrapped up strong and do grow articles shaped pad, which can effectively reduce menstrual pain and inconvenience his wife. This pad of the 20th century European and American countries began 4O's popularity, and gradually developed into the use of disposable materials.

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