In a moderately active individual, glucose and insulin levels begin to rise after

Question

BlackTom AI · Accepted Answer

Skeletal muscle contraction drives insulin-independent glucose uptake through GLUT4 translocation; when activity ceases, this mechanism quickly declines and circulating glucose begins to rise, prompting increased insulin secretion. Evidence from metabolic physiology shows these changes become detectable after about 30 minutes of sedentary time in a moderately active individual.

1) Relevant knowledge points and concepts
- Skeletal muscle is a major sink for postprandial glucose; contraction mobilizes GLUT4 to the cell surface independent of insulin.
- When muscle contraction stops, contraction-mediated glucose uptake falls rapidly.
- The pancreas responds to even small rises in blood glucose by increasing insulin secretion to restore homeostasis.
- Short-term cessation of activity thus produces measurable changes in glucose and insulin within tens of minutes.

2) Step-by-step reasoning
- During moderate activity, contraction-mediated GLUT4 keeps peripheral glucose uptake high.
- Upon transitioning to sedentary posture, contraction stimuli end and GLUT4 returns to intracellular stores, reducing glucose disposal.
- Blood glucose concentration therefore begins to increase as disposal drops relative to ongoing hepatic glucose output and any continuing absorption.
- The beta cells detect this rise and stimulate insulin secretion, raising plasma insulin levels.

3) Intermediate “calculation”/timing steps (conceptual)
- Time 0: activity stops, contraction-mediated uptake falls immediately.
- By ~15 minutes: homeostatic buffering and residual insulin action limit large excursions, so changes are small.
- By ~30 minutes: cumulative reduction in peripheral uptake produces a detectable rise in glucose; insulin secretion increases accordingly.

4) Why the correct answer is correct
- The physiology above and experimental observations indicate detectable rises in glucose and insulin appear on the order of tens of minutes, with about 30 minutes being the point at which changes are reliably observed in moderately active people.

5) Why other options are incorrect
- 15 minutes: too short for a clear, measurable rise because residual uptake and insulin action buffer small changes.
- Four and eight hours: these are much longer timeframes reflecting prolonged inactivity or fasting states; the initial rise occurs well before these intervals.

6) Conclusion
This reasoning confirms that glucose and insulin levels begin to rise after 30 minutes of sedentary time, matching the provided correct answer.

In a moderately active individual, glucose and insulin levels begin to rise after单项选择题

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