Question:
Why pH in arteries is more than in veins
Answer:
Recall the differences in the blood circulation in veins and arteries.
In the veins, the blood that floes is deoxygenated, or that is it is has high amounts of carbon dioxide in it. Carbon dioxide can react with the water content in the blood and form carbonic acid as shown in the equation-
CO2 + H2O → H2CO3
Therefore, due to the formation of carbonic acid in blood, the pH of blood reduces below physiological pH of blood, that is pH 7.4.
However, there is no such acid foration in arteries as only oxygenated blood flows in it at pH 7.4.
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