Stanley George Clayton
Contributor
Professor of Obstetrics and Gynecology, King's College Hospital Medical School, University of London, 1967β76.
Primary Contributions (3)
Menstrual cycle, recurring fluctuations in hormone levels that produce physical changes in the uterus and ovaries to prepare the female body for pregnancy. In adult women, the menstrual cycle lasts anywhere from 21 to 40 days, with the average being 28 days. The cycle recurs until menopause, orβ¦
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