Knowledge Organiser
Part of Contraception · GCSE GCSE Biology revision
This topic summary covers Knowledge Organiser within Contraception for GCSE Biology. Topic 9: Contraception It is section 11 of 12 in this topic. Use this topic summary to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 11 of 12
Practice
15 questions
Recall
20 flashcards
Knowledge Organiser
Key Terms
- Contraception: Method to prevent pregnancy
- FSH: Follicle-stimulating hormone from the pituitary; causes egg maturation and stimulates oestrogen production; its release is suppressed by oestrogen in the combined pill
- Oestrogen (in combined pill): Inhibits FSH release from the pituitary gland, preventing egg maturation and ovulation
- Progesterone: Thickens cervical mucus; suppresses LH
- Barrier method: Physical prevention (condoms, diaphragm)
- IUD: Device in uterus; copper or hormonal
- Sterilisation: Surgical, permanent contraception
Must-Know Facts
- Pill contains oestrogen (inhibits FSH) and progesterone (thickens mucus)
- No FSH = no egg maturation = no ovulation = no pregnancy
- Condoms are the only method also protecting against STIs
- Implant/injection: slow-release progesterone, lasts months/years
- Copper IUD: toxic to sperm; no hormones
- Sterilisation: permanent; cutting/blocking fallopian tubes or vas deferens
- Perfect vs typical use affects real-world effectiveness
Common Mistakes
- Confusing oestrogen and progesterone roles: In the pill, oestrogen primarily inhibits FSH (preventing egg maturation); progesterone primarily thickens cervical mucus — these roles are not interchangeable in exam answers.
- Forgetting the FSH mechanism: Never just say "the pill prevents pregnancy" — always state the mechanism: oestrogen inhibits FSH production from the pituitary, so no eggs mature and ovulation does not occur.
- Saying condoms are unreliable without adding their unique benefit: Condoms are the only method that also protects against STIs — this point must be included in any compare/evaluate question about contraceptive methods.
- Describing sterilisation as reversible: Sterilisation is a permanent surgical procedure — always state it is intended to be permanent when answering questions about its advantages and disadvantages.
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Practice Questions for Contraception
Which hormone triggers the release of an egg from the ovary (ovulation)?
Explain the role of oestrogen in the menstrual cycle.
Quick Recall Flashcards
15 questions on Contraception — practise free
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