why CO2 is more and O2is less in exhaled air?
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Exhaled air isn't exactly like alveolar air either. O2 is a little higher and CO2 is a little lower because of the air in the "dead space". D. Gas exchange between lungs and blood, blood and tissues. When we exhale, we breathe out less oxygen but more carbon dioxide than we inhale. The carbon we breathe out as carbon dioxide comes from the carbon in the food we eat. ... The glucose molecule is then combined with oxygen in the cells of the body in a chemical reaction called "cellular oxidation
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