Which of the following occurs if a bird's inhaled air bypasses the posterior air sacs during ventilation?

💡 Explanation

When airflow bypasses the posterior sacs, it disrupts the unidirectional ventilation by failing to provide the continuous airflow across the lungs thereby reducing the gas exchange efficiency because deoxygenated air cannot be adequately expelled. Therefore lowered oxygen extraction occurs, instead of other metabolic effects, mite susceptibility, or vocal impairment without direct sac involvement.

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