Hemoglobin
a. combines preferentially with O2 over any other substance.
b. when combined with carbon dioxide is known as carboxyhemoglobin.
c. plays a critical role in determining the amount of O2 that is exchanged between alveoli and blood, because it acts as a storage depot, removing dissolved O2 from the blood thereby keeping PO2 low and allowing net diffusion of O2 to continue until the hemoglobin is completely saturated.
d. both (a) and (b) above.
e. all of these answers
C
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