Menstrual Cycle

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  • Menstrual cycle
    • Lasts 28 days and the egg is released on day 14 (ovulation)
    • oestrogen
      • causes thickening of the uterus to prepare for implantation of egg
      • levels  peak on day 10 then begin to fall
    • FSH
      • Causes the egg to mature
    • LH
      • Stimulatesthe release of the egg during ovulation
    • a decrease in oestrogen causes LH and FSH to start increasing
    • Ovulation occurs when LH and FSH levels peak
    • Progesterone
      • maintains the thick lining of uterus
      • Inhibits the release of LH and FSH
      • Egg matures on day 14 and progesterone starts increasing after this until it reaches its peak 3 days later
      • if the egg isn't fertilised, levels fall and uterus lining breaks down into a period


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