A 58-year-old woman with a long-standing use of ibuprofen for osteoarthritis presents to her doctor because of excessive tiredness. Laboratory studies reveal a hemoglobin concentration of 9 g·dl−1 (normal 13 to 15 g·dl−1). Which of the following abnormalities would you most likely observe?A. Decreased diffusing capacity for carbon monoxide B. Decreased functional residual capacity C. Decreased residual volume D. Increased physiologic dead space E. Increased ventilation to the upper lung zones

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