Which outcome minimizes oxygen loss during avian tidal ventilation in bird lungs?

💡 Explanation

When air passes through avian lungs, crosscurrent exchange occurs because parabronchi orientation is perpendicular to blood capillaries, maximizing average oxygen partial pressure difference. Therefore, crosscurrent exchange results, rather than alternatives; increased ventilation raises metabolic cost, dead space limits efficiency, and unidirectional flow requires complex anatomical structures.

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