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why is menstrual cycle absent during pregnancy?

HCG prevents the breakdown of corpus luteum, which continues to secrete progesterone and oestrogen and these bring about increased growth of the endometrium of the uterus. Loss of the lining of the endometrium in prevented and this leads to the absence of menstruation.

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lack of ovulation

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abscence of ovulation

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due to absence of ovulation during gestation period

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During pregnancy HCG helps in the maintainance of corpus luetium which secretes progestrone which in turn helps to prevent ovulation and helps in the maintainance of pregnancy.

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