This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Carbon di oxide is transpoed in plasma as:September 2005 
Select and explain. 
A. Dissolved form, B. Carbamino compounds, C. Bicarbonate, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Ans. D: All of the aboveCO2 is carried in blood in three different waysMost of it (about 70% - 80%) is conveed to bicarbonate ions by the enzyme carbonic anhydrase in the red blood cells5% - 10% is dissolved in the plasma5% - 10% is bound to hemoglobin as carbamino compounds