Which event occurs in the lungs?
a. Free H+ binds to hemoglobin.
b. Plasma HCO3? enters erythrocytes.
c. CO2 and H2O are converted into HCO3? and H+ in the plasma.
d. Carbonic anhydrase converts CO2 and H2O into HCO3? and H+ in erythrocytes.
e. CO2 binds to hemoglobin.
ANSWER: b
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