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Menstrual flow onset caused by?

Discussion in 'MCAT Study Question Q&A' started by m25, 09.21.14.

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  1. m25

    m25

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    Does decreased level of estrogen alone during the luteal phase cause the onset of menstrual flow, or is it the decreased level of both estrogen and progesterone that causes the onset of menstrual flow?
     
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  3. tdod

    tdod 2+ Year Member

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    I am not sure about this, but my understanding is that E & P are high during the luteal phase b/c they are being secreted by the corpus luteum. however, the corpus luteum eventually dies (unless pregnancy occurs) and ceases to secrete E & P. Progesterone is important for encouraging the endometrium to continue growing; I would assume that, without progesterone, the endometrium is shed.
     
  4. Hadi7183

    Hadi7183 2+ Year Member

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    @tdod is right. Progesterone is essential for the maintenance of endometrium ; reduced progesterone level --> menstruation.
     

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