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Is O2 versus CO2 diffusion in lungs dependent on their concentration or not?
For example:In Fick law is included only one gas pressure.So i think,that if I have O2 concentration too low,it doesn t influence the diffusion of CO2.Please,try to explan it me....
THank
1 Answer
- PearlsawmeLv 78 years agoFavorite Answer
During exercise, it is possible to breathe in and out more than 100 liters of air per minute and extract 3 liters of oxygen from this air per minute.
The exchange of gases (O2 & CO2) between the alveoli & the blood occurs by simple diffusion:
O2 diffusing from the alveoli into the blood & CO2 from the blood into the alveoli.
Diffusion requires a concentration gradient.
So, the concentration (or pressure) of O2 in the alveoli must be kept at a higher level than in the blood & the concentration (or pressure) of CO2 in the alveoli must be kept at a lower lever than in the blood.
We do this, of course, by breathing - continuously bringing fresh air (with lots of O2 & little CO2) into the lungs & the alveoli.
