If blood from an area of the lung with a high / is mixed with blood perfusing an area with a low , what will be the result?
a. CaO2 higher than the average of the two
b. CaO2 lower than the average of the two
c. PaO2 equal to the average of the two
d. PaO2 lower than the average of the two
ANS: D
The final O2 content, also arrived at by averaging the high and low / points, is shown as point X on the O2 curve (Figure 12-20). Whereas the averaged value for carbon dioxide was normal, the PaO2 resulting from averaging the O2 content of the high and low / units is well below normal (point "a" on the O2 curve of Figure 12-20).
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