What is the cause of menstruation?

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(C) Menstruation is the shedding of the uterine lining (endometrium) that occurs when an egg is not fertilized. During the menstrual cycle,the corpus

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Decrease in progesterone levels

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(C) Menstruation is the shedding of the uterine lining (endometrium) that occurs when an egg is not fertilized. During the menstrual cycle,the corpus luteum secretes progesterone to maintain the endometrium. If fertilization does not occur,the corpus luteum degenerates,leading to a sharp decrease in the levels of progesterone. This withdrawal of progesterone causes the breakdown of the endometrial lining and its blood vessels,resulting in menstruation.

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