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Breathing and Exchange of Gases question

2014 · Q10
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Breathing and Exchange of Gases question

2014 · Q10

NEETBiologyBreathing and Exchange of GasesMCQ+4 / −1
Approximately seventy percent of carbon-dioxide absorbed by the blood will be transported to the lungs
  1. A
    as bicarbonate ions
  2. B
    in the from of dissolved gas molecules
  3. C
    by binding to R.B.C.
  4. D
    as carbamino - haemoglobin.
View written solutionFree

Correct answer: A

About 70% of CO2 (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 (H2CO3).

Carbonic anhydrase, exclusively found in RBCs, speeds up the formation of H2CO3 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 (H+) and bicarbonate ions (HCO3−HCO_3^ - HCO3−​).

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