Most of the Carbon Dioxide Produced by the Body Is

Question

Most of the carbon dioxide produced by the body is transported to the lungs ____.  
A) in gaseous form
B) in the lymph system
C) as carbaminohemoglobin
D) in the form of bicarbonate
E) as carbonic acid

Accepted Answer

Carbon dioxide is transported in the form of bicarbonate ions, which are formed when carbon dioxide reacts with water in the bloodstream. These bicarbonate ions are then transported in the plasma to the lungs, where they are converted back into carbon dioxide and exhaled.