Multiple Choice
Refer to the figure showing the hemoglobin-oxygen binding/dissociation curve. 
Which statement about hemoglobin's O2-binding/dissociation curve is true?
A) At rest, our body's hemoglobin activity can be illustrated by only the upper one-fourth of its O2-binding/dissociation curve.
B) A smaller decrease in PO2 is required for hemoglobin to drop from 100 to 75% saturation than for hemoglobin to drop from 75 to 50% saturation.
C) Our blood normally carries a small reserve of O2.
D) The steepest part of the O2-binding/dissociation curve results in a small release of O2 for a large drop in PO2.
E) The PO2 of our blood drops well below 40 mm Hg during light exertion.
Correct Answer:
Verified
Correct Answer:
Verified
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