Percentage of CO2 carried by plasma proteins is:
Correct answer: C. 7%
- A. 5%
- B. 6%
- C. 7%
- D. 8%
Explanation
Carbon dioxide (CO2) is transported in the blood in three main forms. Approximately 7% of CO2 is transported bound to plasma proteins, which is a minor but significant component of CO2 transport. The majority of CO2 (about 70%) is converted to bicarbonate ions in the plasma, while around 20% is carried by hemoglobin as carbaminohemoglobin. Therefore, option C is correct. Options A, B, and D are incorrect because they either underestimate or overestimate the percentage of CO2 carried by plasma proteins.
This question appeared on the ETEA MDCAT 2016 paper, which you can sit online with every answer explained.
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