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Diagram illustrating how the uterus lining builds up and breaks down during the menstrual cycle Menstruation (also known as a period, among other colloquial terms) is the regular discharge of blood and mucosal tissue from the inner lining of the uterus through the vagina. The menstrual cycle is characterized by the rise and fall of hormones. Menstruation is triggered by falling progesterone ...
Twenty seven families, which had from two to seven sisters 13 years or older and collected data on menstrual cycle onsets over a three-month period. Using the methods of, [51] they reported menstrual synchrony occurred for the first two months, but not for the third month for roommate sisters, close friend roommates, and for families as a whole ...
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 ...
A woman was attacked by a bear in 1967, and, because she was approaching her period, a myth began that this is why the bear attacked her. [But] absolutely you can camp on your period.” – Dr ...
A large North American survey reported only a 2–3 month decline from the mid-1970s to the mid-1990s. [36] A 2011 study found that each 1 kg/m 2 increase in childhood body-mass index (BMI) can be expected to result in a 6.5% higher absolute risk of early menarche (before age 12 years).
Amenorrhea or amenorrhoea is the absence of a menstrual period in a female who has reached reproductive age. [1] Physiological states of amenorrhoea are most commonly seen during pregnancy and lactation (breastfeeding). [1] Amenorrhoea is a symptom with many potential causes. [2]
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The two friends had each bought a train ticket known as the Interrail or Eurail pass, allowing young travelers a period of unlimited rail travel around Europe. ... Some months later, the next ...