Partial Pressure of gases in fluids Each gas has a specific solubility 0, Solubility coefficient=0.003 ml/100 ml Blood C02=0.06 ml/100 ml Blood(x 20 of02) Gases dissolve in fluids by moving down a Partial Pressure gradient rather than a concentration gradient Consider a container of fluid in a vacuum That is opened to the air Molecules of gas begin to enter the fluid
6 Consider a container of fluid in a vacuum Partial Pressure of Gases in Fluids Each gas has a specific solubility O2 Solubility coefficient = 0.003 ml/100 ml Blood C02 = 0.06 ml/100 ml Blood (x 20 of 02) Gases dissolve in fluids by moving down a Partial Pressure gradient rather than a concentration gradient That is opened to the air Molecules of gas begin to enter the fluid
Partial Pressure of gases in fluids After a short time the number of molecules the number of molecul ENTERING LEAVING At equilibrium, if the gas phase has a PO2=100 mm Hg. ne liquid phase also has a po2=100 mm Hg ● An easy way to talk about gases in fluids 7
7 Partial Pressure of Gases in Fluids After a short time, the number of molecules the number of molecules ENTERING = LEAVING At equilibrium, if the gas phase has a PO2 = 100 mm Hg, the liquid phase also has a PO2 = 100 mm Hg An easy way to talk about gases in fluids
Diffusion: Blood Transit Time in the Areo Alveolus Blood capil Time for exchange P mm Hg 100 g Saturated very quickly Reserve diffusive capacity of the 40 Ing Co2 Time 0.75 sec
8 Alveolus Blood capillary Time for exchange PO2 Time 0 0.75 sec 40 100 Saturated very quickly Reserve diffusive Capacity of the lung 45 mm Hg PCO2 Diffusion: Blood Transit Time in the Alveolus
II Gas exchange in the lung and in the tissue
9 II Gas exchange in the lung and in the tissue