At what exercise level would the alveolar-arterial PO2 difference be expected to change?
A. It will increase when 40% or more of maximum oxygen consumption is reached
B. It will increase when 60% or more of maximum oxygen consumption is reached
C. It will start to decrease when 40% or more of maximum oxygen consumption is reached
D. It will start to decrease when 60% or more of maximum oxygen consumption is reached
Answer: A
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