Carbon dioxide can be transported to the lungs through blood in three different ways, that is, it might get transported by simply dissolving in the blood or it can be buffered with water in the form of carbonic acid or it can bind to haemoglobin protein and get transported. Though a significant part of carbon dioxide is transported as carbamino-haemoglobin, a large portion is transported in the form of bicarbonate. Also, a small portion of carbon dioxide gets dissolved in plasma.