Which of the following lung units would be most prone to air-trapping?
a. One with high resistance and low compli-ance
b. One with low resistance and low compli-ance
c. One with normal resistance and low com-pliance
d. One with high resistance and high com-pliance
ANS: D
Air-trapping occurs with incomplete emptying of lung units. Lung units prone to air-trapping are those with long-time constants (i.e., with high resistance or high compliance).
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