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Menstrual cycles are absent during pregnancy. Why?

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asked Dec 6, 2017 in Biology by sforrest072 (157,439 points) ● 61 ● 410 ● 949
Menstrual cycles are absent during pregnancy. Why?

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answered Dec 6, 2017 by mdsamim (213,225 points) ● 5 ● 10 ● 15
selected Feb 24, 2018 by sarthaks
 
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The high levels of progesterone and estrogens during pregnancy suppress the gonadotropins which is required for the development of new follicles.
Therefore, a new cycle cannot be initiated.

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