When receiving oxygen via nose, the alveolar oxygen level rises and the concentration of oxygen relative to carbon dioxide in the lungs rises.
The diffusion distance is unaffected by this therapy if the bronchioles are constricted as a result of inflammation and/or mucus buildup. Alveoli's potential surface area for diffusion is likewise unaffected.
Despite the increase in the concentration of oxygen that is accessible in the alveoli, the diffusion distance remains same, preventing oxygen from reaching the circulation.
Thus, When receiving oxygen via nose, the alveolar oxygen level rises.
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