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  4. Approximately seventy percent of carbon-dioxide absorbed by the blood will be transported to the lungs

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Q. Approximately seventy percent of carbon-dioxide absorbed by the blood will be transported to the lungs

AIPMTAIPMT 2014Breathing and Exchange of Gases

Solution:

About 70% of CO., (about 2.5ml per 100 ml. of blood), received by blood from the tissues, enters the RBCs where it reacts with water to form carbonic acid (H2C03). Carbonic anhydrase, exclusively found in RBCs, speeds up the formation of HC03 and rapidly converts it back to carbon dioxide and water when blood reaches the lungs. Almost as rapidly as formed, all carbonic acid of RBCs dissociates into hydrogen (IT) and bicarbonate ions (HCO3).