Imagine a typical alveolar capillary, carrying blood over thesurface of an alveolus. What is the partial pressure of O2 at thestart of the capillary; what is the partial pressure of O2 at theend of the capillary? Draw a graph showing how O2 partial pressurechanges over the length of the capillary. Does the curve that youhave drawn indicate perfusion- or diffusion-limited transport? Howwould this curve change if the diffusing capacity of the lungdecreased substantially? How would this curve change if the cardiacoutput increased substantially?
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