Final answer:
The erythrocyte anion exchange protein facilitates the exchange of chloride and bicarbonate ions in red blood cells.
Step-by-step explanation:
The erythrocyte anion exchange protein is an example of a protein that actively transports chloride ions in and bicarbonate ions out of red blood cells, or vice versa, depending on bicarbonate concentration. This process is known as the chloride shift.
When there is a higher concentration of bicarbonate in the erythrocytes than in the surrounding blood plasma, some of the bicarbonate leaves the erythrocytes and moves into the plasma in exchange for chloride ions.
In summary, the erythrocyte anion exchange protein facilitates the exchange of chloride and bicarbonate ions in red blood cells, helping to maintain the proper balance of these ions.