phys Question

[burnish33]

under physiologic conditions, the LOWEST partial pressure of oxygen is found in :
a.epired air
b.alveolar air
c.venous blood
d. arterial blood
e. normal atmospheric air

the answer key says VENOUS blood is the right answer, but why wouldn't it be expired air??

any help is appreciated : )

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[elz787]

I was wondering the same thing, anyone? is it because that asyou exhale it comes into contact with oxygen?? i dunno