What effect does rapid exhalation of CO2 during exercise have on the concentration of H2CO3 in the blood?

Humans breathe in oxygen and breathe out carbon dioxide. During the process of breathing, humans convert sugar into energy. Carbon dioxide is a waste product of this process. Carbon dioxide is released into the blood, travels to the lungs and is exhaled. Because carbon dioxide is a weak acid, the more carbon dioxide in the blood, the more acidic the blood becomes.