Which physiological adaptation shifts hibernating marmots abruptly from torpor to active state?

💡 Explanation

During arousal from hibernation, increased skeletal muscle glycolysis rate generates rapid heat production through substrate cycling allowing rapid increase in body temperature beyond what brown fat alone can provide. Therefore muscle glycolysis enables the transition, rather than fat suppression, kidney urea reabsorption, or brain hypometabolism which slow awakening.

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