Core Biology - Fertility and menstrual cycle - AQA

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  • Created by: Krupa
  • Created on: 29-05-13 13:47
Preview of Core Biology - Fertility and menstrual cycle - AQA

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HORMONES IN THE MENSTRUAL CYCLE
1) FSH produced by pituitary gland matures an egg and stimulates oestrogen
2) Oestrogen produced by ovaries inhibits the production of FSH and stimulates LH. This
thickens the lining of the womb.
3) LH produced by pituitary gland releases the egg.
HORMONES FOR CONTROLLING FERTILITY
STOPPING PREGNANCY = ORAL CONTRACEPTIVES
ENCOURAGING PREGNANCY = IVF TREATMENT
Oral contraceptives
1) At first it contained lots of oestrogen caused headaches, high BP and nausea
2) Then and now it contains Oestrogen and Progesterone this cause less side effects
Progesterone thickens the entrance of the womb to stop sperm from getting in
Advantages: over 99 per cent effective, reduces the risk of getting cancer
Disadvantages: Not 100 per cent chance, cause side effects and doesn't protects against STD'S
IVF treatment ­ when not enough FSH being produced
1) Fertility drug containing FSH and LH causes release of several mature eggs
2) Take out the eggs and put into a petri dish
3) Fertilise those eggs by injecting the sperm from the father which joins to the eggs
4) Form embryos, then inject the embryo back into the mother
5) PREGNANT WOOP WOOP
Advantages: Helps a lot of women get pregnant
Disadvantages: Doesn't always work, expensive and chance of multiple births

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