If a patient with emphysema experiences increased physiological dead space in their lungs due to alveolar damage, which consequence follows regarding respiratory gas exchange?

💡 Explanation

Emphysema damages alveoli, impairing gas exchange and increasing dead space, which reduces the functional area for oxygen diffusion. Because less oxygen is transferred to the blood, arterial oxygen partial pressure decreases. Therefore, the correct answer is reduced arterial oxygen, rather than increased elimination due to the decreased functional surface.

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