Menstrual cycle

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  • Created by: Alice
  • Created on: 12-05-13 13:30
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  • 1) Uterus lining breaks down (period)
    • Repair of uterus wall
      • Egg released by the ovary
        • Lining thickens waiting for a fertilised egg
          • No fertilised egg so cycle starts again
          • Empty follicle gradually disappears
            • Drop in O and P triggers a period
              • This triggers FSH in the pituitary gland to stimulate the growth of a new egg
          • Progesteroneis produced by follicle to maintain the uterus lining
            • If ferilisation occurs a placenta is formed which carries on producing progesterone to maintain the uterus wall
        • Ovulation (egg released)
          • The follicle develops into a corpus luteum which releases progesterone to maintain the uterus lining
      • Oestrogen is produced by the ovaries and causes uterus to thicken
        • High levels of O stimulates production of LH from the pituitary gland. This triggers ovulation
    • Follicle with egg gradually develops


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