CAIE A Level Biology 9700 · Homeostasis
A student measured her blood glucose concentration at intervals after eating a carbohydrate-rich meal. The results are shown in the table.
| Time after meal (minutes) | Blood glucose concentration / mmol l |
|---|---|
| 0 | 5.0 |
| 30 | 7.8 |
| 60 | 8.5 |
| 90 | 6.3 |
| 120 | 5.1 |
The normal blood glucose set point is about 5.0 mmol l.
Outline the homeostatic mechanisms that restore blood glucose concentration to its set point after a carbohydrate-rich meal. Use the data to support your answer.
7 marks, so the mark scheme is looking for about 7 separate creditworthy points. Making the same point twice in different words earns it once.
Outline means: Give the main points briefly. Less detail than describe, but every key step has to be there. One short line per step, in order. The marks are for coverage, not depth.
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