Researchers investigate whether a medicine used to treat a condition unrelated to reproduction affects the menstrual cycle. They measure peak hormone concentrations over complete cycles before and during treatment.
For each hormone, its peak concentration before treatment is taken as 100%.
| Hormone | Peak concentration during treatment as a percentage of the peak before treatment (%) |
|---|---|
| FSH | 35 |
| oestrogen | 40 |
| progesterone | 25 |
Use information from the table to explain why taking the medicine could reduce the chance of becoming pregnant.
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.