The table shows relative hormone concentrations before ovulation in one cycle.
Table
| Day | Oestrogen | LH | Progesterone |
|---|---|---|---|
| 8 | 30 | 5 | 2 |
| 11 | 75 | 6 | 2 |
| 13 | 120 | 18 | 2 |
| 14 | 90 | 65 | 3 |
Which interpretation best explains the timing of the hormone changes?
High progesterone stimulates an LH surge that triggers egg release.
High oestrogen stimulates an LH surge that triggers egg release.
High LH stimulates an oestrogen surge that triggers menstruation.
High oestrogen stimulates a progesterone surge that triggers menstruation.
48 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.