A researcher measured the concentrations of progesterone and oestrogen in a person's blood during one menstrual cycle.
| Day of cycle | Progesterone concentration (nmol/L) | Oestrogen concentration (pmol/L) |
|---|---|---|
| 10 | 2 | 180 |
| 16 | 25 | 300 |
| 24 | 45 | 250 |
| 29 | 3 | 100 |
Between which two measurements did ovulation most likely occur? Explain your answer.
Explain what the changes in hormone concentrations by day 29 are likely to cause.
In a different cycle, progesterone concentration remains high after day 24, but a treatment prevents the uterus lining from responding to progesterone. Predict what would happen to the uterus lining and explain why.
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.