Fig. 1 shows a glucose sensor trace for a cyclist who ate a meal containing bread and fruit at 08:00. The sensor measures glucose concentration in the blood...
Question 1 Report
Fig. 1 shows a glucose sensor trace for a cyclist who ate a meal containing bread and fruit at 08:00. The sensor measures glucose concentration in the blood every few minutes. The cyclist is healthy and did not eat again before 11:00. The rise after the meal is followed by a return towards the starting concentration. This control prevents body cells from being exposed to a very high glucose concentration for a long time.
(a) Describe the change in blood glucose concentration between the meal and 10:00. [2]
(b) What substance is released by the pancreas when the blood glucose concentration rises? [1]
(c) Give one way in which this substance causes the blood glucose concentration to fall. [1]
Answer Details
(a) Blood glucose concentration rises after the meal [1] and then falls towards its starting or normal concentration by 10:00. [1]
(b) The pancreas releases insulin when blood glucose concentration rises. [1]
(c) Insulin can cause liver or other body cells to take up glucose from the blood, or cause glucose to be converted to glycogen for storage. Either process lowers blood glucose concentration. [1]
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