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The Intricacies of Menstruation and Evolution
This chapter delves into the detailed processes of the menstrual cycle, from thickening of the uterine lining to shedding and sealing of blood vessels, comparing the force of uterus contractions to labor. It explores the variation in pain experiences during menstruation and the evolutionary development of menstruation across different species, contrasting it with estrus cycles and discussing the reproductive benefits of human ovulation. The imperfections of evolution are also addressed, highlighting how hormonal birth control influences menstruation and the myth regarding the necessity of having a period for health.