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MDCAT Biology QUESTION #11261
Question 1
The majority of carbon dioxide in the blood is transported as:
  • Dissolved CO$_2$ in plasma
  • Carbaminohemoglobin
  • Bicarbonate ions (HCO$_3^-$)✔️
  • Carbonic acid
Correct Answer Explanation
Approximately 70% of CO$_2$ is transported as bicarbonate ions (HCO$_3^-$) in the plasma. About 20-23% binds to hemoglobin as carbaminohemoglobin, and only 7-10% is dissolved in plasma.