Question

question:
what part of the blood sugar negative feedback loop releases insulin?
○ liver cells release glucose into the blood and blood sugar rises
○ after a long time between meals, blood sugar level drops
○ body cells take up sugar from the blood and the blood sugar drops
○ shortly after a meal, the blood sugar rises

Explanation:

The question is about the blood sugar negative feedback loop and which option relates to insulin release. However, none of the given options directly state the part that releases insulin (the pancreas). But among the options, "Shortly after a meal, the blood sugar rises" is the stimulus that triggers the pancreas (not listed in options) to release insulin. Wait, no—actually, the options provided don't include the correct part (pancreas), but maybe there's a mis - option. Wait, re - evaluating: The blood sugar negative feedback loop: when blood sugar rises (after a meal), the pancreas (effector) releases insulin. The option "Shortly after a meal, the blood sugar rises" is the event that leads to insulin release. The other options: liver cells releasing glucose is part of low blood sugar response; blood sugar dropping after long time between meals is a stimulus for glucagon; body cells taking up sugar is the effect of insulin, not the release. So the event that leads to insulin release is blood sugar rising after a meal.

Answer:

D. Shortly after a meal, the blood sugar rises (assuming the options are labeled A - D as: A. Liver cells release glucose into the blood and blood sugar rises; B. After a long time between meals, blood sugar level drops; C. Body cells take up sugar from the blood and the blood sugar drops; D. Shortly after a meal, the blood sugar rises)