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