<prompt> Most important from of carbon-dioxide transport in the bloodIt is mostly transported as carboxy hemoglobinAs dissolved CO2As bicarbonatesDue to CO2 molecules attached to hemoglobin  <response>: The route by which most of the carbon dioxide is carried in the bloodstream. Once dissolved in the blood plasma, carbon dioxide combines with water to form carbonic acid, which immediately ionizes into hydrogen and bicarbonate ions. The bicarbonate ions serve as part of the alkaline reserve. 