2. Menstruation is a physiological cycle that occurs between some fertile female humans and chimpanzees and other animals. Spiny mice, cows, mares, camels, sows, ewes, etc. Menstruation also occurs, and some mammals go through estrus cycle. In women of childbearing age and primate females, the endometrium undergoes autonomous thickening, vascular proliferation, gland growth and secretion, endometrial collapse and shedding, accompanied by periodic bleeding changes every other month. This periodic vaginal bleeding or uterine bleeding is called menstruation. Blood flowing out during menstruation is also called menstruation.
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