Which mechanism optimizes avian respiration during flight when the sternum oscillates significantly?

💡 Explanation

When sternum motion influences pressure, avian air sacs change volume because they lack direct muscular control, passively driven by thoracic cavity oscillations, supplementing lung ventilation during flight. Therefore air sac volume shifts optimize respiration, rather than full diaphragm action, rib change, or intercostal control under these conditions.

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