AQA GCSE Biology Unit 1 2.2 Fertility treatments
- Created by: revisieacocobean
- Created on: 14-05-16 15:28
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- Control in the human body
- Hormones
- Secreted by glands and are transported to the target organ by the blood stream
- Made in endocrine glands which form the 'endocrine system'
- What needs to be controlled
- Water content- lost when we breathe and via the kidneys in the urine
- Ion content- lost via skin and kidneys
- Temperature- to maintain the enzymes at their optimum temperature
- Blood sugar level- To provide cells with a constant supply of energy
- Menstrual cycle
- Pituitary gland releases FSH
- Stimulates egg maturation
- Stimulates the release of oestrogen from the ovaries
- Oestrogen then...
- causes the uterus lining to thicken
- Switches off FSH
- switches on LH
- releases the egg from the ovary
- IF EGG IS FERTILIZED then progestrone is released which maintains the uterus lining and stops the release of FSH
- IF EGG ISNT FERTILIZED then period occur and the cyle begins again
- releases the egg from the ovary
- Oestrogen then...
- Pituitary gland releases FSH
- Fertility treatments
- Contraceptive pills stop FSH production so the egg maturation
- Combined- low doses of Oestrogen and Progesterone
- Decreases risk of womb cancer by 50%
- Risk of blood clots
- Decreases risk of cancer in ovaries by 40%
- Mini pill- progesterone
- Less side effects
- Must be taken punctually
- Combined- low doses of Oestrogen and Progesterone
- Fertility drugs- injection of FSH to mature egg
- multiple pregnancies (more than one egg released)
- Weight gain
- headaches
- Nausea
- IVF
- 1. Drugs taken to suppress natural cycle
- 2. take FSH injection for 12 days so more eggs are produced
- 3. Vaginal ultrasound and blood tests to monitor. 38 hours before eggs are collected
- 4. Aspiration (needle inserted to collect eggs)
- 5. eggs mixed with sperm. The best fertilized embryos are transferred into the prepared womb
- Vantages
- Costs £5000-£8000
- spare embryos are destroyed
- Multiple births
- Embryos can be frozen and used for a later date
- Contraceptive pills stop FSH production so the egg maturation
- Hormones
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