When we breathe in air, nitrogen also goes inside along with oxygen. What is the fate of this nitrogen?

Monjur Alahi

When we breathe in air, nitrogen also goes inside along with oxygen. What is the fate of this nitrogen?

(a) It moves along with oxygen into the cells
(b) It comes out with the CO2 during exhalation
(c) It is absorbed only by the nasal cells
(d) Nitrogen concentration is already more in the cells so it is not at all
absorbed.


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Salim Ahmed Kawsar

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Answer is (b) It comes out with the CO2 during exhalation 

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Salim Ahmed Kawsar

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When we breathe, nitrogen does enter our body along with oxygen and carbon-di-oxide but is not exchanged at the alveolar level. This is because our body cannot utilize the free nitrogen present in the air. We full fill our nitrogen requirements via. food we consume since they have nucleic acids and proteins which provide us the required nitrogen. Also, blood doesn’t have any mechanism of carrying free nitrogen.

so, the Nitrogen inhaled is exhaled out as it is.

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