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Which example demonstrates positive feedback?

Rationale

Increased milk production by a feeding newborn.

This example illustrates positive feedback because it describes a process that amplifies a response—in this case, the more a newborn feeds, the more milk is produced by the mother, enhancing the feeding process.

A (Lowering blood sugar levels after a sweet snack) YOUR ANSWER

This scenario represents a negative feedback mechanism where the body reduces blood sugar levels after they rise due to food intake. The action counters the initial change, maintaining homeostasis rather than amplifying it.

B (Shivering when the body is cold) YOUR ANSWER

Shivering is also a negative feedback response designed to generate heat and raise body temperature when it drops. This mechanism works to restore balance rather than increase the intensity of the initial condition.

C (Retaining water after heavy exercise) YOUR ANSWER

Retaining water after exercise is a response aimed at maintaining fluid balance and preventing dehydration, which is another example of negative feedback. The body conserves water to counteract the effects of fluid loss, again not amplifying the initial stimulus.

D (Increased milk production by a feeding newborn) CORRECT

This example clearly demonstrates positive feedback as the act of feeding stimulates further milk production, creating a cycle that enhances the response rather than negating it.

Conclusion

Positive feedback mechanisms amplify physiological processes, as seen in the example of increased milk production in response to a feeding newborn. In contrast, the other options depict negative feedback responses that serve to stabilize the body's internal environment. Understanding these differences is crucial for grasping how various feedback systems function in biological contexts.

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