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| Description: In the cell membrane, C O 2 comes from cellular respiration in peripheral tissues. It then passes through the capillary endothelium to two places. In the venous blood, it dissolves to a concentration of 7 percent in the blood. It also passes into red blood cells. From there, combines with hemoglobin to form carbaminohemoglobin at a 23 percent concentration in the blood. It also combines with water to form carbonic acid, which then disassociates into bicarbonate, and hydrogen plus hemoglobin to form normal hemoglobin. The bicarbonate passes into the venous blood, creating a 70 percent concentration in plasma. Chloride is simultaneously pulled into the red blood cell.
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