Which risk increases when inefficient respiratory countercurrent exchange limits avian oxygen uptake during thermal soaring?

💡 Explanation

When respiratory countercurrent exchange is inefficient, avian oxygen uptake decreases because less oxygen is extracted from air during continuous soaring, shifting energy production to anaerobic metabolism. Therefore, anaerobic metabolism increases, not lactic acid inhibition, reduced glycogen synthesis, or increased cooling, which involve different physiological processes.

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