define menstruation in two lines
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Another word for menstruation is "period." A period is the 2 to 7 days that a girl or woman has her menstrual flow, which is when blood and tissue leave her body through her vagina. ... If the egg isn't fertilized, that lining leaves the body through the vagina and the girl or woman has her period.
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Menstruation is the cyclical changes in the reproductive tract of female primates.
The reproductive period starts from age of 13 and continue tills the age of 45-50 .
Start of menstruation cycle is called menarche and end of cycle called menopause
It has following phases.
Menstrual phase.
Follicular phase.
Ovulatory phase.
Luteal phase/secretory phase.
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