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3. Concerning the single-breath nitrogen test for uneven ventilation:A. The slope of the alveolar plateau is reduced in chronic bronchitiscompared with normal.B. The slope occurs because well-ventilated units empty later inexpiration than do poorly ventilated units.C. The last exhaled gas comes from the base of the lung.D. A similar procedure can be used to measure the anatomic dead space.E. The test is very time consuming.
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