PATHOLOGY MCQ
RESPIRATORY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Most of the carbon dioxide is transported by ____
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hemoglobin
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bicarbonate ion
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carbonic acid
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red blood cells
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Explanation:
Detailed explanation-1: -Carbonic acid almost immediately dissociates into a bicarbonate anion (HCO3-) and a proton. Thus, bicarbonate is the primary means by which carbon dioxide is transport occurs throughout the bloodstream according to the equation CO2 + H2O–> H2CO3–> H+ + HCO3-.
Detailed explanation-2: -The majority of carbon dioxide is transported in the blood as bicarbonate ions.
Detailed explanation-3: -About 70% of carbon dioxide is transported as sodium bicarbonate. As CO2 diffuses into the blood plasma, a large part of it combines with water to form carbonic acid in the presence of the enzyme carbonic anhydrase. Carbonic anhydrase is a zinc enzyme that speeds up the formation of carbonic acid.
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