A scientist tested dialysis fluids using an artificial membrane. At the start of each test, the glucose concentration in the artificial blood was 5.0 mmol/dm³.
| Glucose concentration in the dialysis fluid in mmol/dm³ | Glucose concentration in the artificial blood after 30 minutes in mmol/dm³ |
|---|---|
| 0.0 | 3.6 |
| 2.5 | 4.3 |
| 5.0 | 5.0 |
| 7.5 | 5.8 |
A hospital has dialysis fluids containing either 2.5 mmol/dm³ or 7.5 mmol/dm³ of glucose. A patient has a blood glucose concentration of 4.5 mmol/dm³ before dialysis.
A technician proposes using the fluid containing 7.5 mmol/dm³ of glucose to keep the patient's blood glucose concentration unchanged.
Compare the effects of dialysis fluids with glucose concentrations below, equal to and above the starting concentration in the artificial blood.
Evaluate the technician's proposal.
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.