Asked by Bro
Mrs. Thorne asks her class to give an example of a negative feedback loop. Which student has the BEST example?
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GPT-5 mini
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The student who said something like “when blood sugar rises the pancreas releases insulin to lower it” has the best example.
Why: a negative feedback loop opposes a change and returns the system toward a set point. In blood‑glucose regulation:
- Sensor/control: pancreas (beta cells) detects high blood glucose.
- Effector: insulin is released, causing cells and the liver to take up/store glucose.
- Result: blood glucose falls back toward the set point, which reduces insulin release.
(Other good examples: body temperature regulation — sweating/shunting vessels when hot, shivering/vasoconstriction when cold — or a thermostat/heater. By contrast, childbirth contractions driven by oxytocin are positive feedback, so that would be a poor choice.)
Why: a negative feedback loop opposes a change and returns the system toward a set point. In blood‑glucose regulation:
- Sensor/control: pancreas (beta cells) detects high blood glucose.
- Effector: insulin is released, causing cells and the liver to take up/store glucose.
- Result: blood glucose falls back toward the set point, which reduces insulin release.
(Other good examples: body temperature regulation — sweating/shunting vessels when hot, shivering/vasoconstriction when cold — or a thermostat/heater. By contrast, childbirth contractions driven by oxytocin are positive feedback, so that would be a poor choice.)
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