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Understanding the physiological reason for menstruation.
Summary
Published February 6, 2024,
by
Stéphanie, Doctorate in Life and Health Sciences
—
1 min read
The rules signify the transition to a new cycle.
Menstruation is relatively uncommon in the animal kingdom. Indeed, we only share this characteristic with a few other species: primates (almost all Catarrhines, some Platyrrhines), bats, a species of shrew, and the Peters' elephant-nosed rat. Each month, the cycle begins with menstruation, when the previous cycle has not resulted in pregnancy. The uterus then sheds the lining that had developed to accommodate a fertilised egg. This expulsion is characterised by a blood-like biological fluid (composed of blood, vaginal secretions, and endometrial cells from the uterine wall), which can vary in volume, and lasts between 3 and 7 days and may be accompanied by pain. Finally, if fertilisation occurs, the lining is not eliminated: this is why pregnant women do not menstruate. Thus, menstruation corresponds to a visible manifestation of the menstrual cycle in women of childbearing age.
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