On inspecting a volume-pressure curve of the lungs and thorax, an ...

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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

Question 2

Most of the drop in pressure due to frictional resistance to gas flow occurs in what region?
 
  a. Nose, mouth, and large airways
  b. Respiratory bronchioles
  c. Terminal bronchioles
  d. Terminal respiratory unit

[itsakadoozi]

Answer to Question 1

ANS: C
The larger the area defined by the pressure and volume changes, the greater is the amount of work being done.

Answer to Question 2

ANS: A
Approximately 80 of the resistance to gas flow occurs in the nose, mouth, and large airways where flow is mainly turbulent.