How is most carbon dioxide transported in the blood?
a. As bicarbonate ions in plasma
b. As hydrogen ions in red blood cells
c. As CO2 in plasma
d. As part of hemoglobin in red blood cells
ANS: A
Most carbon dioxide is carried in the blood in the form of bicarbonate ions in the plasma. Hydrogen ions do not transport CO2, and it is not carried in plasma as CO2. Hemoglobin carries oxygen.
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