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.
Correct Answer:
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