During the second half of one menstrual cycle, cells in the pituitary gland stop responding to progesterone. Cells in the uterus continue to respond normally.
The hormone concentrations are measured before and three days after this change.
| Measurement | Progesterone concentration (nmol/L) | FSH concentration (IU/L) |
|---|---|---|
| Before the change | 32 | 3.2 |
| Three days after the change | 33 | 7.1 |
Explain the change in FSH concentration and how this could affect a follicle and the uterus lining.
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.