Two people had excess amino acids in their blood. Person H had a healthy liver. Person D had liver damage. Blood samples were taken before blood entered the liver and after it left the liver.
| Substance | Person H: entering liver | Person H: leaving liver | Person D: entering liver | Person D: leaving liver |
|---|---|---|---|---|
| Total amino acids in mmol / dm³ | 2.8 | 2.2 | 2.8 | 2.7 |
| Ammonia in µmol / dm³ | 30 | 35 | 30 | 100 |
| Urea in mmol / dm³ | 4.0 | 4.6 | 4.0 | 4.1 |
Explain why the results for Person D suggest that the excess amino acids are not being processed safely.
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.