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 O₂until 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.

Question

Quizplus · Accepted Answer

All of the statements are correct. 
A) Hemoglobin binds with oxygen, keeping the partial pressure of oxygen low and favoring the movement of oxygen into the blood until hemoglobin is fully saturated.
B) Hemoglobin can combine with oxygen, carbon monoxide, carbon dioxide, and hydrogen sulfide.
C) When the tissue becomes more acidic, hemoglobin releases more oxygen to meet the increased demand of the tissue for oxygen.
D) Hemoglobin can buffer against changes in pH due to respiratory carbonic acid by picking up excess H+ ions.

Which of the Following Statements Concerning Hemoglobin Is Correct