Why Does Alveolar Air Have Less O₂ Compared with Inhaled

question 66

Multiple Choice

Why does alveolar air have less O₂ compared with inhaled air?

• A) Reduced surface tension in the alveoli leads to reduced O₂ concentration in the alveolar air.
• B) The air turbulence in the nasal conchae dissipates most O₂ from inhaled air.
• C) The O₂ concentration in the atmosphere is less than CO₂ concentration_.
• D) Alveolar air is humidified and, therefore, has more water vapor and less O₂.
• E) Alveolar air is the air in the anatomical dead space that does not participate in the gas exchange.

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