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  4. Withdrawal of which of the following hormones is the immediate cause of menstruation?

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Q. Withdrawal of which of the following hormones is the immediate cause of menstruation?

AIPMTAIPMT 2006Human Reproduction

Solution:

Progesterone is required for the maintenance of the endometrial lining of the uterus. As soon as the production of progesterone is reduced due to reduction in the production of $LH$ from anterior lobe of the pituitary, the endometrium of the uterus breaks down and menstruation begins.