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Breathing and Exchange of Gases question

2011 · Q1
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Breathing and Exchange of Gases question

2011 · Q1

NEETBiologyBreathing and Exchange of GasesMCQ+4 / −1
Bulk of carbon dioxide (CO2) released from body tissues into the blood is present as
  1. A
    bicarbonate in blood plasma and RBCs
  2. B
    free CO2 in blood plasma
  3. C
    70% carbamino-haemoglobin and 30% as bicarbonate
  4. D
    carbamino-haemoglobin in RBCs.
View written solutionFree

Correct answer: A

70% to 75% CO2 is transported as primary buffer of the blood bicarbonate ion (HCO3) in blood plasma. When CO2 diffuses from tissues into blood then it is acted upon by the enzyme carbonic anhydrase.

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