Which Statement About the Transport of Respiratory Gases by the Blood

question 183

Multiple Choice

Which statement about the transport of respiratory gases by the blood in humans is true?

• A) The amount of O₂ that can be dissolved directly in plasma is sufficient to support the resting metabolism.
• B) By binding O₂, hemoglobin prevents an O₂ concentration gradient from forming between the blood and the tissues.
• C) Internal perfusion of the gas exchange surfaces is dependent on blood flow.
• D) Each hemoglobin molecule can carry a maximum of two O₂ molecules.
• E) Molecules of O₂ are associated with the polypeptide subunits of hemoglobin.

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