menarche
Physiology
(noun)
Menarche is the first menstrual cycle, or first menstrual bleeding, in female human beings.
Psychology
(noun)
The onset of menstruation in human females; the beginning of the menstrual period.
Examples of menarche in the following topics:
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Puberty
- For females, it is menarche, the onset of menstruation, which occurs on average between ages 12 and 13.
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Innate Resistance
- Vaginal secretions serve as a chemical barrier following menarche, when they become slightly acidic, while semen contains defensins and zinc to kill pathogens.
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Biological Differences
- ., menarche) of puberty onset whereas males (and their parents) are generally uncertain of the exact onset of puberty, which could skew these interpretations).
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Physical Development in Adolescence
- Girls experience menarche, the beginning of menstrual periods, usually around 12–13 years old, and boys experience spermarche, the first ejaculation, around 13–14 years old.