STANDARDZoology-Respiratory System
STANDARD Zoology Gas Exchange MCQ Question
Type: MCQ-conceptual-Medium
The partial pressure of oxygen in the alveolar air is
A
45 mm Hg
B
95 mm Hg
C
104 mm Hg
D
110 mm Hg
Correct Answer
Option C
Detailed Explanation
The partial pressure of oxygen in alveoli is about 104 mm Hg which is much higher than systemic capillaries of blood 94 mm Hg. As a result, oxygen diffuses from alveoli into the blood and then to tissues that have PO₂ 40 mm Hg.
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