Which mechanism minimizes heat loss when a hibernating arctic squirrel begins to rewarm?

💡 Explanation

When a hibernating arctic squirrel begins to rewarm, countercurrent heat exchange becomes more efficient because core temperature increases, creating a larger gradient that recovers heat from blood leaving the extremities. Therefore countercurrent efficiency increases, keeping heat within the core rather than vasodilation, BAT activation, or rate reduction alone effectively conserving it.

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