Which mechanism reduces heat loss in arctic mammals initiating shivering thermogenesis?

💡 Explanation

When arctic mammals initiate shivering, peripheral vasoconstriction limits blood flow to extremities by decreasing capillary size, minimizing heat transfer to the environment, because metabolic heart source is lower. Therefore vasoconstriction reduces heat, rather than vasodilation, brown fat increase require stimulus, of active sweating transports less heat.

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