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Humans regulate the glucose concentration of their blood - Edexcel - GCSE Biology - Question 3 - 2012 - Paper 1
Question 3
Humans regulate the glucose concentration of their blood. A scientist recorded the blood glucose concentration of an individual over a seven-hour period. The resul... show full transcript
Worked Solution & Example Answer:Humans regulate the glucose concentration of their blood - Edexcel - GCSE Biology - Question 3 - 2012 - Paper 1
Step 1
Describe the trend in blood glucose concentration for this seven-hour period.
Answer
The blood glucose concentration shows an initial increase from 76 mg/100 cm³ at 06:00 to a peak of 124 mg/100 cm³ at 08:00. After this peak, there is a gradual decrease, reaching 79 mg/100 cm³ by 12:00. Finally, the concentration rises again to 130 mg/100 cm³ at 13:00.
Step 2
Suggest reasons for the changes in blood glucose concentration.
Answer
The increase in blood glucose concentration from 06:00 to 08:00 can be attributed to food intake, as it is common to have breakfast during this time. The subsequent decrease until 12:00 may be due to glucose being used for energy or stored, particularly as insulin is released to regulate blood sugar levels. Physical activity could also play a role during this period, further leading to lower glucose levels. The increase at 13:00 may occur after further food consumption or a lack of exercise, resulting in the rise in glucose concentration.