Question

unit 1 cumulative test (characteristics of life, biomolecules, cell structure and tra
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possible po
which of the following is an example of a negative feedback loop?
∘ blood clotting after an injury
∘ childbirth contractions increasing until delivery
∘ sweating to cool down the body
∘ a fever rising to fight infection

Explanation:

To determine the negative feedback loop, we analyze each option:

• Blood clotting (positive feedback: amplifies clotting until injury is sealed).
• Childbirth contractions (positive feedback: contractions increase until delivery).
• Sweating (negative feedback: body temperature rises, sweating cools it down, reversing the change).
• Fever rising (positive feedback in the context of fighting infection as it amplifies the response, though fever itself is part of a complex system, but compared to others, sweating is a clear negative feedback).

Answer:

C. Sweating to cool down the body