Where the concentration pCO2 is more(in 'expired air' or 'alveolar air')???

We know that concentration of CO2 is less in atmosphere compared to oxygen so partial pressure of that compound or element will be more which is having high concentration in atmosphere and less in our body so pressure will act from high concentration to low concentration so pO2 is more in inspired air and less inside the body as O2 is used by cell for respiration there is less O2 in body and more pCO2 in expired air because when aerobic respiration is done by cell it will result in formation of CO2 and H2O that is also one of the raeson behind it and the main reason was concentration in atmosphere and partial pressure as i told you above
 
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In expired air , the concentration or pCO2 is Higher
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Expired air
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