A researcher measured the concentrations of four hormones in blood samples from one person during a menstrual cycle. The cycle was not affected by treatment. Day 1 was the first day of menstruation.
| Day of cycle | FSH (IU/L) | LH (IU/L) | Oestrogen (pmol/L) | Progesterone (nmol/L) |
|---|---|---|---|---|
| 3 | 8 | 5 | 180 | 2 |
| 10 | 5 | 7 | 650 | 3 |
| 14 | 4 | 32 | 1100 | 5 |
| 21 | 3 | 4 | 500 | 45 |
| 27 | 9 | 3 | 160 | 3 |
Explain how the data support the roles of the four hormones in controlling this cycle. In your answer, include the effect expected if a treatment prevented the rise in LH on day 14.
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.