Researchers Are Studying Pulmonary Gas Exchange in Various Physiological and Pathological

Researchers are studying pulmonary gas exchange in various physiological and pathological states using animal models.  In one experiment, the partial pressure of oxygen (PO₂) in the upper airways is determined to be 150 mm Hg while breathing ambient air at rest.  Analysis of the respiratory gases in a particular lung segment reveals the following: Which of the following best explains these respiratory gas findings?

A) Bronchopulmonary shunting
B) Diffusion impairment
C) Normal alveolar ventilation and perfusion
D) Intrapulmonary shunting
E) Poor alveolar ventilation

Correct Answer:

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