Q: What is the value of partial pressure of oxygen in alveolar air?  

Answer: C

The partial pressure of oxygen in alveolar air is 104 mm Hg. This value is higher than its value in arterial blood, which is 40 mm Hg. Therefore, oxygen diffuses from the alveolar air to arterial blood due to the pressure gradient. This process is essential for efficient oxygen exchange in the lungs. It is important to maintain an appropriate balance of partial pressures of gases in the alveoli to ensure proper respiratory function.

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