Hormones in menstruation

• FSH causes the egg to mature and stimulates the ovaries to produce estrogen.
• The ovaries produce LH which triggers ovulation, releasing eggs.
• If the egg is fertilised, progesterone levels remain high and it maintains the uterus lining.
• If the egg is not fertilised, progesterone levels drop and it stops maintaining the uterus lining, breaking down.
• The menstrual cycle repeats until the egg is fertilised.
• The egg is released at day 14
• 1. FSH stimulates the ovaries to produce oestrogen
  2. As the oestrogen levels increase they start to inhibit FSH (negative feedback)
  3. When oestrogen levels get high they stimulate the release of LH, which causes ovulation
  4. Progesterone inhibits both LH and FSH.
• The average menstrual cycle lasts 28 days and mensturation lasts for 4 days
• The Menstrual cycle

  1. Menstruation - Period of bleeding as the uterus lining breaks down
  2. Building up of the uterus lining 
  3. Ovulation - Release of the egg from the ovaries 
  4. Maintenance of uterus lining
  5. (If no fertilised egg) Cycle starts again from stage 1
• Which hormone stimulates the uterus lining to develop?

  Oestrogen
• Which organ are both luteinising hormone and follicle stimulating hormone released from?

  Pituitary gland
• Which hormone stimulates the egg to be released around day 14 (ovulation)?

  Luteinising hormone (LH)
• Which hormone stimulates the egg follicle to mature?

  Follicle stimulating hormone (FSH)
• Which hormone maintains the lining of the uterus?

  Progesterone