The Major Form by Which Carbon Dioxide is Transported in the Circulatory

Question

The major form by which carbon dioxide is transported in the circulatory system is:
A)in solution.
B)as bicarbonate ions.
C)as carbaminohemoglobin.
D)none of the above.

Accepted Answer

Carbon dioxide is transported in the circulatory system mainly as bicarbonate ions. When carbon dioxide enters erythrocytes, it reacts with water to form carbonic acid which then dissociates into bicarbonate ions and hydrogen ions. These bicarbonate ions are then transported in the plasma to the lungs where they are converted back into carbon dioxide for elimination.