A researcher records measurements from a person at three times.
The results are shown in the table.
| Blood concentration | ADH concentration in blood (pmol/L) | Urine volume (mL/hour) | Concentration of dissolved substances in urine (g/L) |
|---|---|---|---|
| Below normal | 0.8 | 120 | 20 |
| Normal | 1.6 | 75 | 32 |
| Above normal | 3.1 | 30 | 80 |
Explain how the results show the response to blood becoming more concentrated and how this response helps restore water balance.
85 exam-style questions on AQA GCSE Biology 5.3 Hormonal coordination in humans, covering 5.3.1 Human endocrine system, 5.3.2 Control of blood glucose concentration, 5.3.3 Maintaining water and nitrogen balance in the body, 5.3.4 Hormones in human reproduction, 5.3.5 Contraception, 5.3.6 The use of hormones to treat infertility (HT only), and 5.3.7 Negative feedback (HT only). Each one has a worked solution and a mark scheme showing where the marks go.