PG NEXT Question of the Day 31-10-2016


The below figure represents the compliance curve of lung. What does the marked area correspond to?

a. Inspiration
b. Expiration
c. Residual volume
d. FRC

Answer: a. Inspiration

Compliance is developed due to the tendency for tissue to resume its original position after an applied force has been removed. After an inspiration during quiet breathing (eg, at the FRC), the lungs have a tendency to collapse and the chest wall has a tendency to expand. Compliance of the lung and chest wall is measured as the slope of the P TR curve, or, as a change in lung volume per unit change in airway pressure (ΔV/ΔP).

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