Which mechanism maximizes oxygen extraction in avian lungs during flight, despite the rapid air compression changes?

💡 Explanation

During flight, varying compression affects oxygenation; unidirectional airflow via airsacs allows continuous oxygenated air flow across parabronchi because this design prevents mixing of inhaled/exhaled air. Therefore, unidirectional parabronchial airflow maximizes extraction, rather than alternatives relying on less constant or alternative circulatory components.

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