1. Partial pressure of the gases
2. Solubility of the gases
3. Surface area
4. Diffusion distance
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 Blood||Tissues|
All units in mmHg.