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Question
What is menstruation? Explain.
Solution
In females, the reproductive phase of life begins at puberty (10 to 12 years of age) and generally lasts till the age of approximately 45 to 50 years. The ova begin to mature with the onset of puberty. In about 28 to 30 days, one of the ovaries matures and releases one ovum. During this period, the wall of the uterus becomes thick so as to receive the egg, in case it is fertilised and begins to develop. This results in pregnancy. If fertilisation does not occur, the released egg, and the thickened lining of the uterus, along with its blood vessels, are shed. This causes bleeding in women, which is called menstruation.
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