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the first step is when the oxygen is inhaled .then the air follows the following rote;

nose----nasal cavity-----larynx------------trachea-----------bronchi-------lung------------bronchioles ----------alveoli 

the exchange of gases takes place in alveoli.only a thin membrane separates the air in alveoli from the blood in capillaries .oxygen diffuses into the blood and co2 diffuses out

thn the carbon dioxide follows the inverse route and get out through our nose

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mark best i gave in simple language dude
he have asked for 10points so wwe have to answer for that points detailed
but u didnt write and this is only the mechanism dude,,,,,,,,,
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