Carbon dioxide is produced as a by-product of cellular metabolism and is transported in the blood to the lungs, to be expelled from the body through exhalation. The transport of carbon dioxide in the blood occurs through three main mechanisms. First, there is a portion of carbon dioxide that is directly dissolved in the plasma, which is the liquid part of blood. The next part of carbon dioxide is bound to hemoglobin, what's called carbaminohemoglobin. Most of the amount of carbon dioxide is chemically dissolved in the plasma as bicarbonate ions (HCO3-).
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