A person with type 1 diabetes takes part in three days of environmental fieldwork.
On each day, the person injects the same dose of insulin before lunch. They measure their blood glucose concentration immediately before lunch and two hours after lunch.
| Day | Carbohydrate in lunch / g | Time spent walking after lunch / min | Blood glucose concentration before lunch / mmol dm−3\mathrm{mmol\,dm^{-3}}mmoldm−3 | Blood glucose concentration two hours after lunch / mmol dm−3\mathrm{mmol\,dm^{-3}}mmoldm−3 |
|---|---|---|---|---|
| A | 60 | 20 | 5.4 | 5.8 |
| B | 30 | 20 | 5.5 | 3.9 |
| C | 60 | 80 | 5.3 | 3.7 |
Calculate the change in blood glucose concentration on day B and on day C.
Suggest which day the insulin dose was most closely matched to the person's food intake and activity. Use the data to explain your answer.
Explain why the change in blood glucose concentration on day B and on day C was different from the change on day A.
Suggest one change the person could make on day B or day C to reduce the risk of their blood glucose concentration falling too low. Explain your answer.
94 exam-style questions on Edexcel GCSE Biology 7.4 Blood glucose and the urinary system, covering 7.4.1 Insulin and blood glucose control, 7.4.2 Glucagon and blood glucose regulation, 7.4.3 Type 1 and type 2 diabetes, 7.4.4 Structure of the urinary system, 7.4.5 Structure and function of the nephron, 7.4.6 ADH and water regulation, 7.4.7 Treatments for kidney failure, and 7.4.8 Production of urea in the liver. Each one has a worked solution and a mark scheme showing where the marks go.