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  4. The majority of CO2 is transported into blood as

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Q. The majority of $CO_2$ is transported into blood as

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Solution:

$70\%$ of $CO_2$ received by blood from the tissues, enters the RBCs where it reacts with water to form carbonic arid $(H_2CO_3)$. This carbonic acid of RBCs dissociates into hydrogen and bicarbonate ions $(HCO_3^-)$ so majority of $CO_2$ transported in blood is in the form of bicarbonates.