Maximal Expiratory Flow Rates Decrease During Exhalation (I

Multiple Choice

Maximal expiratory flow rates decrease during exhalation (i.e.,in going from higher to lower lung volumes) for the following reasons:

A) Intra-airway pressures increase and elastic recoil pressure increases at lower lung volumes.
B) Intra-airway pressures decrease and elastic recoil pressure increases at lower lung volumes.
C) Intra-airway pressures increase and elastic recoil pressure decreases at lower lung volumes.
D) Intra-airway pressures decrease and elastic recoil pressure decreases at lower lung volumes.
E) There is no change in intra-airway pressures or elastic recoil pressures at lower lung volumes.