Which response to overcooling does not involve muscle contraction?

Blood vessels narrowing

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Hairs standing up

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Shivering

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Reduced sweating

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Solution

The correct option is D Reduced sweating
In response to over-cooling,
muscles allow blood vessels narrowing(circular muscles), piloerection(hair standing up by erector pili muscles), and shivering.
Reduced sweating does not involve muscle contraction or relaxation.
So, the correct answer is 'Reduced sweating'.

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