Question

Which gas increases in blood and alveoli after purification of blood?

Answer 1

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oxygen gas increases in blood and alveoli after purification of blood...
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Answer 2

After the purification of blood, the level of oxygen increase in blood.

During the process of purification, carbon dioxide is taken from blood through   capillaries which diffuses oxygen to the blood and takes carbon dioxide out. The oxygen in blood is transported to all the other parts of body via blood cells.