Which Event Occurs in Lung Blood

Question

Which event occurs in lung blood? A) Plasma HCO3^- enters erythrocytes. B) In erythrocytes, carbonic anhydrase converts CO2and H2O into HCO3^- and H⁺. C) Free H⁺ binds to hemoglobin. D) CO2binds to hemoglobin.

Accepted Answer

In the lungs, bicarbonate ions (HCO3-) in the plasma enter erythrocytes, where they are converted back to CO2 for exhalation.