Under Normal Situations,the Normal Ventilation to Perfusion Ratio Is 4:5

Under normal situations,the normal ventilation to perfusion ratio is 4:5 (0.8) .Atelectasis can cause a shunt-producing ventilation/perfusion mismatch.This occurs primarily as a result of

A) perfusion exceeding ventilation.
B) ventilation exceeding perfusion.
C) an alveolus that is receiving ventilation but not perfusion.
D) an alveolus that is receiving perfusion but not ventilation.

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