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Bronchoalveloar segments of lung with low ventilation/perfusion ratios may collapse when 100% O 2 is inhaled for 1 hr because:

a. pulmonary surfactant is inactivated
B. O2 toxicity causes alveolar edema
C. CO 2 elimination is greater than normal
D. interstitial edema arond small airways causes airway closure
E. gas is removed by blood faster than it enters the unit by ventilation


D? extreme vasodilation of the regional capillaries?



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