Question

When we breathe in, we inhale many gases, including oxygen. What happens to the gases that the body can't use? *

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

the two most common gases in air besides oxygen are nitrogen (N2) and argon, both of which are chemically and biologically inert. Together with oxygen they comprise over 99% of atmospheric gases by volume.

Every component of respiratory gas, however, reaches (or is at least driven to) equilibrium with pulmonary blood flowing past the alveoli of the lungs. In particular the partial pressure of each gas component seeks to equilibrate with the partial pressure of that gas dissolved in blood.

Unlike O2 & CO2, however, nitrogen and argon are neither produced nor consumed by the body, so once pressure equilibrium is reached with blood then nothing changes throughout the respiratory cycle. Nitrogen is inhaled and exhaled at the same levels*.

The presence of an inert gas in the inhaled mixture is physiologically beneficial, however, because it helps prevent closure of the less well-ventilated alveoli—which may lead to clinically significant resorption atelectasis, sometimes seen in patients given 100% O2 to breathe for extended periods (not to be confused with O2 toxicity).

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