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← Nature & AnimalsWhich outcome occurs during avian respiration within the parabronchial lungs?
A)Reduced oxygen extraction at high altitudes
B)Unidirectional airflow enhancing gas exchange✓
C)Increased dead space due to tidal ventilation
D)Decreased efficiency from alveolar collapse
💡 Explanation
During avian respiration a countercurrent exchange mechanism between air capillaries and blood capillaries facilitates unidirectional air flow because blood flows opposite to airflow, maintaining a constant oxygen concentration gradient. Therefore unidirectional airflow enhances gas exchange, rather than other options which involve different respiratory mechanisms.
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