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Menarche (/ m ə ˈ n ɑːr k i / mə-NAR-kee; from Ancient Greek μήν (mēn) 'month' and ἀρχή (arkhē) 'beginning') is the first menstrual cycle, or first menstrual bleeding, in female humans. From both social and medical perspectives, it is often considered the central event of female puberty, as it signals the possibility of fertility ...
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 ...
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 ...
Knowing the first day of a woman’s last menstrual period is useful in other ways. Dr. Arlene Go, an ob-gyn and specialist fellow studying endometriosis at Hera Biotech, tells Yahoo Life that it ...
The first menstrual bleeding is referred to as menarche, and typically occurs about two years after thelarche. [53] The average age of menarche is 12½ in the United States. [58] Most American females experience their first period at 11, 12 or 13, but some experience it earlier than their 11th birthday and others after their 14th birthday.
Menstrual cycle. The menstrual cycle is on average 28 days in length. It begins with menses (day 1–7) during the follicular phase (day 1–14), followed by ovulation (day 14) and ending with the luteal phase (day 14–28). [1]
The term metrorrhagia is often used for irregular menstruation that occurs between the expected menstrual periods. [9] [10] Oligomenorrhea is the medical term for infrequent, often light menstrual periods (intervals exceeding 35 days). [11] Polymenorrhea is the medical term for cycles with intervals of 21 days or fewer.
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