Carbon dioxide can react with water to produce bicarbonate and hydrogen ions through 2 reversible reactions as follows: CO2 + H2O ↔ H2CO3 ↔ H+ + HCO3- Blood flows from arteries into capillaries and then into veins. As the blood moves through the capillaries, carbon dioxide produced by the cells enters the blood. Therefore, venous blood has a higher pH than arterial blood.

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Carbon dioxide can react with water to produce bicarbonate and hydrogen ions through 2 reversible reactions as follows: CO2 + H2O ↔ H2CO3 ↔ H+ + HCO3- Blood flows from arteries into capillaries and then into veins. As the blood moves through the capillaries, carbon dioxide produced by the cells enters the blood. Therefore, venous blood has a higher pH than arterial blood.