In human physiology, what is the primary physiological mechanism by which carbon dioxide () is transported in human blood?
Answer and explanation
Correct answer: B. As bicarbonate ions () dissolved in blood plasma
- Step 1: About 70% of blood carbon dioxide is converted by carbonic anhydrase into bicarbonate ions () in erythrocytes and transported in plasma. **Answer: As bicarbonate ions () dissolved in blood plasma. Why not the others:** Only about 20% binds to hemoglobin (carbaminohemoglobin) and 7-10% dissolves as free gas.
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