What are the physiologic benefits of maintaining alveolar recruitment? I. Recruited alveoli improve ventilation–perfusion matching. II. Transpulmonary pressure decreases. III. The surfactant monolayer does not require repeated reconstruction during ventilation. IV. Pulmonary compliance decreases
A. I, II only
B. I, III only
C. I, II, III only
D. II, III, IV only
?ANS: B
A. Incorrect response: See explanation B.
B. Correct response: Maintaining alveolar recruitment provides several benefits. They include: (1) recruited alveoli improve ventilation–perfusion matching and gas exchange, (2) recruited alveoli appear to have less risk of injury from shear stress from repeated opening and closing, and (3) recruited alveoli do not have to repeatedly construct the surfactant monolayer, thus improving lung compliance.
C. Incorrect response: See explanation B.
D. Incorrect response: See explanation B.
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