C02 is primarily transpoed in the aerial blood as:
Transpo of carbon dioxide in the form of bicarbonate ions accounts for approximately 70% of the carbon dioxide transpoed from the tissues to the lungs. Thus this is by far the most impoant of all methods of transpo. Ref: Textbook of Medical Physiology By Guyton, 10th Edition, Page 471
Dissolved C02
Carbonic Acid
Carbamino-hemoglobin
Bicarbonate