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Corpus luteum is pregnancy has a long life. However, if fertilization does not take place, it remain

Corpus luteum is pregnancy has a long life. However, if fertilization does not take place, it remains active only for 10 - 12 days. Explain.

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Corpus luteum is retained in response to gonadotropin hormone LH. During pregnancy, maternal endometrium regularly sends signals to hypothalamus for inducing anterior pituitary to secrete LH. In the absence of pregnancy, LH secretion decreases resulting in degeneration of corpus luteum.
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