Which of the Following Statements Concerning Hemoglobin Is Correct

question 116

Multiple Choice

Which of the following statements concerning hemoglobin is correct?

• A) the presence of hemoglobin keeps the blood PO₂ low and favors O₂ movement into the blood despite a very large transfer of O₂ until hemoglobin is completely saturated.
• B) hemoglobin can combine with O₂, CO₂, H⁺, and CO.
• C) hemoglobin unloads more O₂ in the presence of increased tissue acidity.
• D) hemoglobin buffers against changes in pH due to respiratory carbonic acid.
• E) all of these answers.

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