Which mechanism causes increased blood flow in hibernating ground squirrels during periodic arousals?

💡 Explanation

During arousal from hibernation, previously constricted blood vessels experience vasodilation due to the accumulation of metabolic waste products like carbon dioxide, triggering smooth muscle relaxation in vessel walls because reduced vasocontriction, leading to increased blood flow. Therefore vasodilation occurs, rather than angiogenesis which develops over longer periods, increased red blood cell counts or flow changes linked to cooling.

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