Total lung-thorax compliance in normal subjects is about what level?
a. 0.1 L/cm H2O
b. 0.2 L/cm H2O
c. 1.0 L/cm H2O
d. 2.0 L/cm H2O
ANS: A
In healthy adults, the compliance of the lungs and chest wall are approximately equal at 0.2 L/cm H2O. However, because the lungs are contained within the thorax, the two systems act as springs pulling against each other. This reduces the compliance of the system to approximately half that of the individual components, or 0.1 L/cm H2O.
Impedance to ventilation by the movement of gas through the airways is called airway resistance.
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