Experiment: Researchers injected insulin into a fasting rabbit and measured its blood glucose levels every 30 minutes for 4 hours.Observation: Blood glucose dropped sharply in the first 2 hours, then stabilized at a low level.Question: What does this experiment suggest about insulin's role?
Correct answer: A. Insulin lowers blood glucose by promoting its uptake.
- A. Insulin lowers blood glucose by promoting its uptake.
- B. Insulin raises glucose levels during fasting.
- C. Insulin inhibits all glucose activity in blood.
- D. Insulin has no effect on fasting animals.
Explanation
The correct answer is that insulin lowers blood glucose by promoting its uptake. This is supported by the observation of a sharp decrease in blood glucose levels after insulin injection. Option B is incorrect as insulin does not raise glucose levels during fasting but rather lowers them. Option C is incorrect because insulin does not completely inhibit all glucose activity in the blood. Option D is incorrect as the experiment clearly demonstrates the effect of insulin on blood glucose levels in fasting animals.
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