Which of the following lung units would empty and fill most slowly?
a. A unit with high resistance and high com-pliance
b. A unit with high resistance and low com-pliance
c. A unit with low resistance and high com-pliance
d. A unit with low resistance and low com-pliance
ANS: A
Lung units have a short time constant when resistance or compliance is low. Lung units with short time constants fill and empty more rapidly than those with normal compliance and re-sistance. The inverse also holds true. Those units with a high resistance and compliance will fill and empty the most slowly.
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