Figure 5.
Schematic diagram of the physiochemical processes that influence the simultaneous blood-tissue exchange of O2 and CO2. CA is carbonic anhydrase, the enzyme accelerating the CO2 hydration reaction inside the RBCs and tissue. The HCO3−/Cl− exchange between plasma and RBCs occurs through the band-3 anion channels on the membrane of RBCs, satisfying the Gibbs-Donnan electrochemical equilibrium principle. [Figure from Geers54]
