Which physical change occurs when shrews increase metabolic heat production via shivering thermogenesis at cold exposure?

💡 Explanation

When shrews encounter cold, shivering thermogenesis begins because skeletal muscles repeatedly contract using ATP, releasing energy as heat. Therefore, muscle fiber contraction rate increases to generate more heat output, rather than uncoupling, vasoconstriction, or setpoint elevation which require separate mechanisms.

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• Which risk fundamentally escalates as avian migratory flight commences after significant premigratory fat loading?
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