So let's just use the color black and this forms the carbonic acid. And now the carbonic acid is broken down in the reverse reaction to basically form the water as well as the carbon dioxide. But remember, about 10% of the carbon dioxide was also being held by the hemoglobin. And what happens within the red blood cells in the lungs? The hemoglobin releases that carbon dioxide. The 10% into this bundle here and together the 10% released by hemoglobin, the 85% that was held by bicarbonate, and the 5% that was dissolved in the blood plasma.