A medicine is tested during the second half of the menstrual cycle. All the participants have ovulated. One group receives the medicine and a control group does not.
| Mean measurement | Control group, day 19 | Control group, day 25 | Medicine group, day 19 | Medicine group, day 25 |
|---|---|---|---|---|
| Progesterone concentration / ng mL⁻¹ | 18.0 | 17.5 | 17.8 | 17.6 |
| Thickness of uterus lining / mm | 9.0 | 9.2 | 9.1 | 4.0 |
Using the data, suggest how the medicine affects the action of progesterone on the uterus lining. Predict what is likely to happen to the uterus lining if the medicine continues to be taken. Explain your answer.
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.