And then the CO2 is moved across the capillary walls. It diffuses across the capillary wall, our walls, and enters the red blood cells found inside the blood plasma of our capillaries. And once inside the red blood cells, inside the red blood cells, we have a special type of catalytic enzyme known as our carbonic anhydrase. And what carbonic anhydrase does is it combines a single water molecule with a single carbon dioxide gas molecule to produce H, two Co three in the aqueous state. And this is our carbonic acid. Now, because carbonic acid is a weak acid, it will dissociate into these two ions, into an H plus ion and into bicarbonate.