Keo's Notes

Hormones in The Human Reproductive System

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B5__Homeostasis-and-Response

Menstrual Cycle

  1. FSH causes maturation of an egg in the ovary within a structure called a follicle.
    1. Produced in Pituitary Gland.
    2. Stimulates ovaries to produces oestrogen.
  2. Oestrogen causes the lining of the uterus to grow again.
    1. Produced in Ovaries.
    2. Stimulates production of LH and inhibits (stops)further production of FSH.
  3. LH.
    1. Produced in Pituitary Gland.
    2. Its release causes ovulation - release of the egg.
  4. Progesterone
    1. Produced in Ovaries.
    2. Maintains lining of uterus and supports a pregnancy if the egg is fertilised.
    3. Inhibits release of LH and FSH.

Contraception

  1. Contraceptive pill.
    1. Pill contains progesterone or progesterone and oestrogen.
    2. Oestrogen inhibits FHS preventing maturation of an egg.
    3. Lining stops developing.
  2. Patch
  3. Implant
  4. Injection
  5. IUD

Use of Hormones to Treat Infertility

  1. Fertility drugs.
    1. Main hormones are FSH and LH which stimulate maturation and release of the egg.
    2. The woman can then become pregnant normally.
  2. IVF.
    1. Mother is given FSH and LH to encourage the maturation of an egg.
    2. The egg is extracted and fertilised in a lab.
    3. The fertilised eggs develop and then are inserted into the uterus.
    4. Low success rate, Physically stressful, Expensive.

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