Which reaction involving CO2 predominates within erythrocytes in the pulmonary capillaries of the lung?
A. CO2 combines with H+ to form HCO2.
B. CO2 combines with water to form bicarbonate ion and carbonic acid.
C. HCO-3 combines with H+ to form H2CO3, which dissociates into CO2 and H2O.
D. HCO-3 dissociates into H+, CO, and O2.
Answer: C
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