Which of the following statements applies to a lung unit with higher resistance than normal?

a. A given volume change will require less of a pressure change.
b. It will fill and empty more rapidly than a normal lung unit.
c. There will be less volume change for a given pressure change.
d. Volume to this area will remain the same under all conditions.

ANS: C
If the airway is obstructed, high resistance to gas flow can occur in a local area. The pressure drop across the obstruction may be substantial. Less driving pressure is available for alveolar in-flation; thus there is less alveolar volume change.