hormones

    Cards (15)

    • oestrogen
      • produced in ovaries
      • growth of uterus lining
      • stimulates LH
      • inhibits FSH
    • Progesterone
      • produced in ovaries after ovulation
      • Maintains uterus lining
      • Inhibits LH and FSH
    • FSH
      • produced in pituitary gland
      • stimulates mature of eggs in ovaries
      • stimulates oestrogen
    • LH
      • produced in pituitary gland
      • triggers ovulation
    • mensturation cycle
      • day 1-4 there is a drop in progesterone causing the uterus lining to break down
      • day 4-14 this stimulates release of FSH from the pituitary gland which stimulates the devlopment of the follicle in ovary
      • stimulates oestrogen production which inhibits FSH so no more follicles mature
      • oestrogen also builds up lining
      • day 14 stimulates LH which causes ovulation
      • day 14-28 progesterone is released , maintaining uterus lining in case of pregnancy
      • inhibits LH and FSH
      • if there is no pregnancy , progesterone levels drop , restarting the cycle
    • hormone contraceptives
      • if oestrogen levels are high , FSH is inhibited so eggs can't develop or be released
      • If progesterone stays high , the cervix produces thick mucus to stop sperm entering uterus
    • examples of hormonal contraceptives
      • combined pill
      • mini pill
      • contraceptive patch
      • contraceptive implant
      • contraceptive injection
      • plastic IUD
    • combined pill
      • every day for 21 days and then 7 day break
      • oestrogen and progesterone
    • mini pill
      • every day
      • progesterone
    • contraceptive patch
      • weekly
      • oestrogen and progesterone
    • contraceptive implant
      • rod under the skin
      • progesterone
      • 3 years
    • contraceptive injection
      • progesterone
      • 2/3 months
    • plastic IUD
      • hormonal resevoir inserted into uterus
      • 3-5 years
      • progesterone
    • stages of IVF
      • Mother is given FSH and LH to stimulate the development of serveral eggs
      • They are collected and fertilised by the sperm in the lab
      • they develop into embryos
      • once they are little balls of cells they are inserted back into the mothers uterus
    • downsides to IVF
      • Emotionally and physically stressful
      • success rates are low
      • can lead to multiple births putting mother and baby at risk