Breathing room air, a normal PAO2 – PaO2 of 5 to 10 mm Hg ex…
Breathing room air, a normal PAO2 – PaO2 of 5 to 10 mm Hg exists due to which of the following?1. Anatomical shunts2. Pulmonary Embolus3. Regional differences in pulmonary ventilation / perfusion ratio