In inspiration, the intrapleural pressure becomes:
AMore positive
BSame as expiratory level
CInitially positive then negative
DMore negative
Which of the following is a common cause of hypoxia due to ventilation-perfusion mismatch?
AMethemoglobinemia
BPulmonary embolism
CAnemia
DAsthma
Surfactant acts to maintain lung compliance by decreasing which factor?
ASurface tension
BPleural fluid secretion
CIntrathoracic pressure
DPleural pressure
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