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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

7. A 30-year-old woman gives birth to a baby girl at only 29 weeks of gestation. Shortly following birth, the baby develops increasing difficulty with breathing and hypoxemia, and requires mechanical ventilation. The respiratory therapist notes that her airway resistance is normal but her compliance is lower than expected. Which of the following factors is likely responsible for respiratory failure in this case? A. Decreased alveolar macrophage activity B. Decreased alveolar surfactant concentration C. Increased airway mucus production D. Increased edema of the airway walls E. Increased airway smooth muscle contraction

If a subject inhales several breaths of a gas mixture containing low concentrations of carbon monoxide and nitrous oxide: A. The partial pressures of carbon monoxide in alveolar gas and end capillary blood will be virtually the same. B. The partial pressures of nitrous oxide in alveolar gas and end-capillary blood will be very different. C. Carbon monoxide is transferred into the blood along the whole length of the capillary. D. Little of the nitrous oxide will be taken up in the early part of the capillary. E. The uptake of nitrous oxide can be used to measure the diffusing capacity of the lung

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