Roles of Oestrogen & Progesterone in the Menstrual Cycle

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5 Terms

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The Menstrual Cycle

  • one of the secondary sexual characteristics that starts in early adolescence in females (around age 12)

  • Lasts around 28 days long

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The stages of menstrual cycle

  • Ovulation occurs around day 14, with the egg traveling to the uterus

  • If the egg is not fertilised, menstruation(period) begins due to the breakdown of the uterine lining

  • Menstruation lasts around 5-7 days and signals the beginning of the next cycle

  • After menstruation finishes, the lining of the uterus starts to thicken again in preparation for possible implantation in the next cycle

<ul><li><p>Ovulation occurs around day 14, with the egg traveling to the uterus </p></li><li><p>If the egg is not fertilised, menstruation(period) begins due to the breakdown of the uterine lining </p></li><li><p>Menstruation lasts around 5-7 days and signals the beginning of the next cycle </p></li><li><p>After menstruation finishes, the lining of the uterus starts to thicken again in preparation for possible implantation in the next cycle </p></li></ul><p></p>
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Hormonal control of the menstrual cycle

  • controlled by hormones (oestrogen and progesterone)

<ul><li><p>controlled by hormones (oestrogen and progesterone) </p></li></ul><p></p>
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Oestrogen levels

rises from day 1 to peak just before day 14

  • causes the uterine wall to start thickening and the egg to mature

  • peak in oestrogen occurs just before the egg is released

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Progesterone levels

stays low from day 1-14 and starts to rise once ovulation has occurred

  • causes the uterine lining to thicken further; a fall in progesterone levels causes the uterine lining to breakdown (menstruation/’period’)