What is the most important component in the O2 transport system?
a. Dissolved O2 in ml/dl
b. HCO3–
c. Hb
d. PaO2
ANS: C
Progressive falls in blood hemoglobin content cause large drops in arterial O2 content (CaO2). In fact, a 33% decrease in hemoglobin content (from 15 to 10 g/dl) reduces the CaO2 as much as would a drop in PaO2 from 100 to 40 mm Hg.
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Fill in the blank(s) with the appropriate word(s).
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