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QUESTION
Q141) Partial pressure of oxygen in alveolar air is ... [ AMU 2010 ]

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Location pO2 (mmHg)
Alveoli 80-100 (PaO2)
Arterial blood 80-100 (PaO2)
Venous blood 40-50
Lung Capillaries 20-40
Ambient air 160

Answer : (d)