The affinity of Hb for carbon monoxide (CO) is approximately how many times greater than its affinity for O2?
a. 10 to 50 times greater
b. 50 to 90 times greater
c. 100 to 190 times greater
d. 200 or greater
ANS: D
Carboxyhemoglobin (HbCO) is the chemical combination of hemoglobin with CO. Hemoglobin's affinity for CO is more than 200 times greater than it is for O2.
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