Disease and response · GCSE Biology
Fertility treatments
GCSE Biology revision on fertility treatments: IVF, FSH and LH hormones, egg collection and embryo transfer, benefits and ethical concerns, and how fertility drugs stimulate ovulation.
IVF: FSH matures eggs, collect eggs, fertilise in lab, embryo to uterus. Fertility drugs = FSH (and sometimes LH). Ethical issues: multiple embryos, cost, emotional stress. Not the same as contraception.
The important bits
What you need to know
- 1
Some couples have difficulty conceiving (infertility). Causes can include low sperm count, irregular ovulation, blocked fallopian tubes, or hormonal imbalance. Treatments aim to bring egg and sperm together.
- 2
Fertility drugs containing FSH (and sometimes LH) stimulate the ovaries to mature multiple eggs in one cycle. This increases the chance of conception in IVF or timed intercourse.
- 3
In vitro fertilisation (IVF): FSH is given to stimulate egg development; eggs are collected from the ovaries; eggs are fertilised with sperm in a laboratory dish (“in vitro” = in glass); embryos are grown briefly then one or more are transferred to the uterus.
- 4
Progesterone may be given after embryo transfer to help maintain the uterus lining for implantation. Not every cycle succeeds; multiple attempts may be needed.
- 5
IVF helps when fallopian tubes are blocked (natural fertilisation in the oviduct cannot occur) or when other methods have failed. Sperm can be injected directly into an egg (ICSI) in some cases — extension context.
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Benefits: enables pregnancy for couples who could not otherwise conceive; can use stored embryos in some protocols. Success rates have improved over decades.
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Ethical and social concerns: cost and limited NHS availability; emotional and physical stress; risk of multiple pregnancies if several embryos implant; spare embryos destroyed or frozen — moral debate; older maternal age risks.
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Fertility treatment uses the same hormones as the menstrual cycle (FSH, LH, progesterone) but in controlled doses. Contraceptive pills inhibit FSH to prevent ovulation — opposite therapeutic goal.
Quotations worth analysing
Short evidence. Real method.
“FSH stimulates egg maturation in the ovaries; in IVF, mature eggs are collected and fertilised outside the body.”
Name FSH, egg collection, lab fertilisation, embryo transfer — four steps for full marks.
“IVF can help when fallopian tubes are blocked because fertilisation occurs in the laboratory.”
Mechanism reason, not just “IVF helps people have babies”. Tubes blocked = sperm cannot meet egg in vivo.
“Fertility treatments raise ethical issues including the use and fate of spare embryos.”
Balanced answer: hope for parents versus embryo status, cost, and multiple births.
Go deeper
IVF step by step — what to write in order
1) Patient takes FSH to stimulate several follicles to mature. 2) Eggs are collected via a fine needle (sedation). 3) Eggs mixed with sperm in lab; fertilisation. 4) Embryos cultured for a few days. 5) One or two embryos transferred to uterus. 6) Progesterone may support lining. 7) Pregnancy test after two weeks. If too many embryos form, some may be frozen or discarded — ethical issue. Do not confuse with cloning or genetic modification unless the question asks. FSH is from the pituitary in natural cycles; in IVF it is injected in higher doses.
Go deeper
How is this different from the contraceptive pill?
The pill contains oestrogen and/or progesterone to inhibit FSH release, so no egg matures — prevents pregnancy. Fertility drugs increase FSH effect to mature eggs — aims for pregnancy. Same hormones, opposite goal. LH surge causes natural ovulation; in IVF timing of collection is controlled. Students mix “hormones stop pregnancy” with “hormones help pregnancy”. Read the question: contraception or fertility.
Go deeper
Evaluate IVF for six marks
Pros: biological child for infertile couples; bypasses blocked tubes; success for some causes of infertility. Cons: expensive, emotionally draining, physical side effects from drugs, multiple pregnancy risk, low success per cycle for some ages, ethical debate over spare embryos. Religious views may oppose embryo destruction. Judgement: valuable medical technology with limits and ethical oversight. Name at least two pros and two cons with detail, then conclude. “IVF is unnatural” alone scores nothing.
See the idea in action
Outline IVF (4 marks). FSH is administered to stimulate the ovaries to mature several eggs. Eggs are collected from the ovaries. In a laboratory, eggs are fertilised by sperm. One or more embryos are transferred into the uterus, where they may implant and develop. Progesterone may be given to support the uterus lining.
Exam technique
Turn knowledge into marks
Learn FSH’s role in egg maturation and the IVF sequence: stimulate → collect → fertilise in lab → transfer embryo. For ethics, mention spare embryos and multiple pregnancies. Contrast with contraception inhibiting FSH.
Common mistakes
Do not give these marks away
- 01
Saying fertilisation happens in the fallopian tube during IVF.
- 02
Confusing FSH in fertility treatment with FSH inhibition by the contraceptive pill.
- 03
Omitting the laboratory step or calling IVF a single injection.
What is the role of FSH in IVF treatment?
AIt prevents ovulation
BIt stimulates the ovaries to mature eggs before collection
CIt digests the uterus lining
DIt kills sperm in the uterus
Show the answer
It stimulates the ovaries to mature eggs before collection. FSH matures eggs for collection. The contraceptive pill inhibits FSH to prevent ovulation — the opposite effect.
Quick questions
If this is the bit you searched
What is IVF GCSE Biology?
In vitro fertilisation: eggs are collected after FSH stimulation, fertilised with sperm in a lab, and embryos are transferred to the uterus.
Why is IVF used when tubes are blocked?
Fertilisation normally occurs in the fallopian tube. If tubes are blocked, sperm cannot reach the egg in the body, so fertilisation is done in the laboratory instead.
What ethical issues are linked to IVF?
Fate of spare embryos, cost, emotional stress, risk of multiple pregnancies, and access on the NHS.
How do fertility drugs work?
They contain FSH (and sometimes LH) to stimulate the ovaries to produce mature eggs, increasing the chance of conception.