On inspecting a volume-pressure curve of the lungs and thorax, an increase in the mechanical work of breathing above normal would always be indicated by which of the following?
a. Decrease in the area of the vol-ume-pressure curve
b. Decrease in the slope of the vol-ume-pressure curve
c. Increase in the area of the volume-pressure curve
d. Increase in the slope of the vol-ume-pressure curve
ANS: C
The larger the area defined by the pressure and volume changes, the greater is the amount of work being done.
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