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Sunday, September 7, 2008

Gas Exchange

The rate of gas exchange depends on:
1. Partial pressure of the gases
2. Solubility of the gases
3. Surface area
4. Diffusion distance
Partial Pressure
Partial pressure is the pressure exerted by and individual in a mixture of gases.
For example atmospheric pressure = 760 mm Hg
% of O2 of in Atmosphere = 20.95%
PO2 =20.95% of 760 mmHg = 159 mmHg
A gas always diffuses from the region of its higher partial pressure to the region of its partial pressure.



Gas Atm.Air Alveoli Deoxygenated Blood Oxygenated BloodTissues
O2 159 104 40 95 40
CO2 0.3 40 45 4045

All units in mmHg.

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