A skin patch releases artificial versions of oestrogen and progesterone continuously.
Scientists measured FSH and LH concentrations during one cycle. Each result is shown as a percentage of the highest concentration measured without hormonal contraception.
| Condition | Highest FSH concentration during the first half of the cycle / % | Highest LH concentration around the middle of the cycle / % |
|---|---|---|
| No hormonal contraception | 100 | 100 |
| Hormone patch | 32 | 9 |
Explain how these results support the conclusion that the patch is likely to prevent pregnancy.
90 exam-style questions on Edexcel GCSE Biology 7.2 Reproductive hormones, covering 7.2.1 Stages of the menstrual cycle, 7.2.2 Hormonal control of the menstrual cycle, 7.2.3 Hormonal contraception, 7.2.4 Evaluating contraception methods, and 7.2.5 Hormones in Assisted Reproductive Technology. Each one has a worked solution and a mark scheme showing where the marks go.