Bulk of carbon dioxide (CO_2) released from b | vedclass

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(A) The correct answer is $A$. At the tissue site,the partial pressure of $CO_2$ is high due to catabolic processes. $CO_2$ diffuses into the blood ($

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bicarbonate in blood plasma and RBCs

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(A) The correct answer is $A$. At the tissue site,the partial pressure of $CO_2$ is high due to catabolic processes. $CO_2$ diffuses into the blood ($RBCs$ and plasma) and reacts with water to form carbonic acid $(H_2CO_3)$,which then dissociates into bicarbonate ions $(HCO_3^-)$ and hydrogen ions $(H^+)$. Approximately $70\%$ of $CO_2$ is transported in the form of bicarbonates. At the alveolar site,where the partial pressure of $CO_2$ is low,the reaction proceeds in the opposite direction,leading to the formation of $CO_2$ and $H_2O$,which is then exhaled.

Bulk of carbon dioxide $(CO_2)$ released from body tissues into the blood is present as

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