Carbon dioxide is a waste product of our respiration. In general, we breathe in oxygen and up to 4 oxygen (O2) molecules will bind to our Heme groups in our red blood cells, in our lungs. Our blood then carries these oxygen molecules through our blood vessels to our capillaries where it will exchange the oxygens for carbon dioxide. The carbon dioxide will then be brought to the lungs, exchanged for more oxygen and exhaled.
Source – Anatomy class from college.
Carbon dioxide helps mediate autoregulation of the blood supply. If the body detects too much CO2, capillaries expand to allow a greater blood flow to whichever area affected.
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