HL 2 Biology

6.5b: Homeostasis – Glucose Regulation

The Glucose Tolerance Test (p.261)

a) The concentration of glucose at time zero is higher at around 160mg for a diabetic person than a person with normal glucose metabolism, who starts at 80mg.

b) The length of time required to return to the level at time zero is more quicker for an unaffected person as it only takes 3 hours after glucose ingestion, where as it would take longer for a diabetic person to return to the starting glucose concentration after 5 hours.

c) The maximum glucose level is greater for a diabetic person than an unaffected person. The diabetic person could go as high as 380mg but in contrast, the unaffected person has a maximum level of 150mg.

d) The time before glucose levels start to fall is shorter for an unaffected person compared to a diabetic person. It would only take an hour for an unaffected person’s glucose level starts to fall where as it would take double that time, taking 2 hours for a diabetic person’s concentration of glucose to start decreasing.

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