Diffusion gradient for oxygen between the alveoli and pulmonary capillaries?
Alveoli
* Partial pressure of oxygen (PO2) = 100 mmHg
* Concentration of oxygen = 13.4 mM
Pulmonary capillaries
* Partial pressure of oxygen (PO2) = 40 mmHg
* Concentration of oxygen = 5.3 mM
The diffusion gradient for oxygen from the alveoli to the pulmonary capillaries is therefore:
100 mmHg - 40 mmHg = 60 mmHg or
13.4 mM - 5.3 mM = 8.1 mM
This gradient drives the diffusion of oxygen across the alveoli-capillary membrane.
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