Saturday, January 4, 2014

Gas Exchange in Lungs

Gas Exchange in Lungs

How tissue gets oxygen and release carbon dioxide
How Red Cells carry oxygen :
Partial Pressures of Gases in Blood
When a liquid or gas (blood and alveolar air) are at equilibrium, the amount of gas dissolved in fluid reaches a maximum value (Henry’s Law)
Depends upon:
Solubility of gas in the fluid
Temperature of the fluid
Partial pressure of the gas
[Gas] dissolved in a fluid depends directly on its partial pressure in the gas mixture
How tissue gets oxygen and release carbon dioxide
         At normal P02 arterial blood is about 100 mm Hg.
         P02 level in the systemic veins is about 40 mm Hg.
         PC02 is 46 mm Hg in the systemic veins.
Gas Exchange in Lungs