Menstrual cycle

• Stage 1(Day 1-5)-menstruation/uterus lining starts to break down and is lost.

  Stage 2(5-14)-uterus lining thickens and builds up again

  Stage 3(day 14)-ovulation where the egg is released

  Stage 4(Day 14-28)-Uterus lining starts to build up again and is maintained
• Hormones of the menstrual cycle

  1)FSH->causes the egg to mature in the ovary

  2)Oestrogen->causes the uterus lining to thicken

  3)LH->cause the egg to be released(ovulation)

  4)Progesterone->cause the uterus lining to maintain
• Day 1-5-Menstruation, FSH is released ,Egg matures in the follicle, FSH stimulates oestrogen

  Day 5-14-Oestrogen builds up the uterus lining, Oestrogen stimulate LH, Oestrogen inhibits FSH

  Day 14-LH causes the egg to be released(ovulation),LH stimulates progesterone, LH inhibits oestrogen
• If a woman is not pregnant

  -Progesterone level rise after day 14(ovulation) then fall after day 21. Low progesterone level triggers menstruation around day 28.

  If a woman is pregnant

  -Progesterone level increase after day 14 and remain high.
• Before ovulation(Day 1-14)-The egg is described as a follice. It begins to mature in the ovary.

  After ovulation(Day 14-28)-The follice is released from a structure called the Corpus Lutuem. The corpus luteum remains the ovary and releases progesterone.
• 4) Corpus Luteum produces progesterone which maintain the lining if the uterus and stop menstruation , Progesterone inhibits FSH and LH so progesterone level stays high.