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Learn about the menstrual cycle, a series of natural changes in hormone production and the structures of the female reproductive system that makes pregnancy possible. The cycle consists of the ovarian cycle and the uterine cycle, each with different phases and events, such as ovulation, menstruation, and premenstrual syndrome.
A list of timeline articles covering recorded events from prehistory to the present day. Find timelines of ancient, postclassical, modern and future history, as well as natural and human evolution.
Menstruation, or a period, is the regular discharge of blood and mucosal tissue from the uterus through the vagina. It is triggered by falling progesterone levels and is a sign of non-pregnancy. Learn more about the length, duration, bleeding, and hormonal changes of menstruation.
A comprehensive timeline of notable climate events from the past 500 million years, based on paleoclimatology and geology. Includes ice ages, glacial cycles, extinction events, warm and cold periods, and their effects on life and human history.
A menstruation celebration, first moon party, or period party, celebrates menstruation. [ 1 ] [ 2 ] [ 3 ] Different cultures and communities across the globe celebrate Menarche (first period). [ 4 ] This practice is followed by Apache , Ojibwe and Hupa tribal communities from different parts of North America, Ulithi tribe from South Pacific ...
Estrous cycle is a set of hormonal changes in female mammals that affect their sexual receptivity. Learn about the four phases of estrous cycle, the differences from menstrual cycle, and the etymology and nomenclature of the term.
Menstrual synchrony, also called the McClintock effect, [1] or the Wellesley effect, [2] is a contested process whereby women who begin living together in close proximity would experience their menstrual cycle onsets (the onset of menstruation or menses) becoming more synchronized together in time than when previously living apart.
A comprehensive list of named time periods in various fields of study, from prehistory to contemporary history. The early modern period is one of the subdivisions of the modern history, beginning with the fall of Constantinople in 1453 and ending with the Age of Revolutions.