The Living Body B5g

What does oestrogen do?
It causes the repair of the uterus wall
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What is the FSH and what does it do?
It's the follicle stimulating hormone and it stimulates an egg to develop
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What does progesterone do?
It maintains the uterus wall
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What is the LH and what does it do?
The luteinising hormone controls ovulation
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What are both the luteinising hormone and the FSH released by?
The pituitary gland in the brain
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What happen if fertilisation doesn't occcur?
If fertilisation doesn't happen, progesterone and oestrogen levels decrease
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What happens when oestrogen and progesterone levels are low?
Menstruation occurs and a message is sent to the hypothalamus. This starts the cycle again.
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What is the menstrual cycle triggered by?
The receptors in the hypothalamus gland
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What happens when fertilisation occurs?
The level of progesterone stays high and no FSH is produced, no more eggs develop and the uterus lining doesn't break down (you don't menstruate)
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What is artificial insemination?
When sperm is placed into the v a g i n a by syringe
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Why do people use FSH for infertility treatments?
To stimulate egg development
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What is IVF?
When an egg is fertilised by sperm outside the body (n glass)
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What is surrogacy?
When a fertilised egg is placed inside a surrogate mother (another female)
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What are some advantages and disadvantages for such fertility treatments?
They increase the chances of a successful fertilisation and pregnancy. However some disagree and say that such treatments are too expensive for the individual and the NHS.
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What are disadvantages and risks of using IVF?
It costs about £6000, with a 25% success rate and has risks of multiple births and lower birth weights.
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What is egg donation?
Where an egg is donated from another women, then fertilised and placed inside the uterus
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How can foetal development be checked for abnormalities?
By amniocentesis and chromosomal analysis
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What is amniocentesis?
When cells from the amniotic fluid are extracted and tested
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What is chromosomal analysis?
When a blood test is used to test cells for any chromosomal abnormalities
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Why does foetal screening raise ethical issues and risks?
People argue that it's not right to interfere with a natural process and whether an unborn foetus has a right to life. There is also a small risk of expulsion of the foetus.
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How can fertility in humans be controlled? Examples?
By artificial sex hormones. E.g. the contraceptive pill and fertility drugs
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How does contraception (artificial female sex hormones) reduce fertility?
The hormones prevent ovulation by mimicking pregnancy and this inhibits FSH release. Therefore the eggs in the ovary aren't stimulated to develop
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Other cards in this set

Card 2

Front

What is the FSH and what does it do?

Back

It's the follicle stimulating hormone and it stimulates an egg to develop

Card 3

Front

What does progesterone do?

Back

Preview of the front of card 3

Card 4

Front

What is the LH and what does it do?

Back

Preview of the front of card 4

Card 5

Front

What are both the luteinising hormone and the FSH released by?

Back

Preview of the front of card 5
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