Which Statement Best Describes Why O₂ and CO₂ can Both

question 132

Multiple Choice

Which statement best describes why O₂ and CO₂ can both be exchanged simultaneously at the alveoli and pulmonary capillaries?

• A) Blood in both the alveoli and pulmonary capillaries is at equilibrium.
• B) Blood in the alveoli is high in both O₂ and CO_2.
• C) Each gas acts independently and diffuses down its own partial pressure gradient.
• D) Nitrogen is at a high pressure in both the alveoli and pulmonary capillaries and drives the exchange of O₂ and CO₂.
• E) Blood in the pulmonary capillaries is high in both O₂ and CO_2.

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Definitions:

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