Which of the following is true of the oxygen dissociation curve?
A) The normal partial pressure of oxygen (PO2) at which hemoglobin is 50% saturated is 20 mm Hg.
B) A shift to the right or left in response to blood pH is called the Bohr effect.
C) A shift to the left results in lower oxygen affinity.
D) A shift to the right results in less effective delivery of oxygen to tissue.
Correct Answer:
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