Amir has type 1 diabetes. He measures his blood glucose concentration during one day.
The normal range of blood glucose concentration is 4 to 7 mmol per dm3\text{dm}^3dm3.
The Table shows his results.
Table
| Time | What Amir does | Blood glucose concentration in mmol per dm3\text{dm}^3dm3 |
|---|---|---|
| 07:00 | wakes up | 6 |
| 07:30 | eats breakfast and injects insulin | 6 |
| 09:00 | sits in lessons | 8 |
| 12:30 | starts playing football | 5 |
| 13:30 | stops playing football | 3 |
| 14:00 | eats a snack but does not inject insulin | 6 |
Explain why Amir injects insulin when he eats breakfast.
Explain why Amir's blood glucose concentration falls while he plays football.
Suggest why Amir eats a snack at 14:00 but does not inject insulin.
Amir's grandfather has type 2 diabetes.
Give one way that type 2 diabetes is usually treated that is different from Amir's treatment.
72 exam-style questions on OCR GCSE Biology 3.3 Maintaining internal environments, covering 3.3.1 Importance of a constant internal environment, 3.3.2 The skin and body temperature, 3.3.3 Insulin and blood sugar, 3.3.4 Glucagon and blood sugar, 3.3.5 Type 1 and type 2 diabetes, 3.3.6 Osmotic changes in body fluids, 3.3.7 Kidneys and water balance, 3.3.8 Structure of the kidney and tubule, 3.3.9 ADH and kidney tubule permeability, and 3.3.10 Responses to temperature and osmotic challenges. Each one has a worked solution and a mark scheme showing where the marks go.