(A) Why is the partial pressure of O2 (PO2) lower in the lungs than it is in the dead space during inspiration? 
 (B) Af

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answerhappygod
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(A) Why is the partial pressure of O2 (PO2) lower in the lungs than it is in the dead space during inspiration? 
 (B) Af

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(A) Why is the partial pressure of O2 (PO2) lower in the lungsthan it is in the dead space during inspiration? 

(B) After exhalation, why is the PO2 in the dead space afterexhalation lower than it is in the external air? 

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