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    Hi,

    Please could someone quickly check through this to make sure it's scientifically sound?

    http://www.hadrill.org.uk/mirrors/sc...0Explained.pdf

    Thanks,
    Jack.
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    Anyone able to help? My biology exam is tomorrow!


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    I would say the the diagram is good but I have written a more detailed summery below (Note: If your Exam Board has told you that the Corpus Luteum is the remainder of a follicle it's probably best to go with that).

    At the start of the menstrual cycle both Oestrogen and Progesterone are low, which means that LH and FSH are released from the Pituitary gland. FSH causes a follicle to develop, which will itself produce Oestrogen, which will inhibit FSH and LH secretion before a surge of LH is released which starts ovulation. The Corpus Luteum develops separately form the egg and secretes progesterone to maintain the uterus lining. These high levels of Oestrogen and Progesterone prevent LH and FSH secretion. If the egg is not fertilised the Corpus Luteum degenerates and "dies" and progesterone secretion stops. The egg also "dies" and so Oestrogen production also stops. Therefore as both hormones are again in low concentrations the process starts again.
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    And Good Luck in your Exam by the way!
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    Thank you very much!

    I'll try my best!

    Jack.


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