The surface area of the lungs is about 75 m2,

The surface area of the lungs is about 75 m2, and the thickness of the alveolar diffusion layer is about 0.5 micrometers. The P02 in alveolar air is 100 mmHg, while the Po2 of venous blood is 40 mmHg. The diffusion coefficient of O2 in water is about 1.5×10-5 cm2s-1. The solubility of O2 is given by Henry’s law as [O2]= 0.024 P02 ; here [O2] is expressed in ml O2 at STPD per ml of water and P02 is in atmospheres. Only the dissolved O2 diffuses. What is the initial rate of O2 diffusion from the aggregate alveoli to the blood?

 

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