Misreading answer choices

[erythrocyte666]

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How do you all avoid this? In the example posted, by "exercise" I interpreted it to mean the action of hyperventilating before the competition and hence got it wrong.

 

[DrknoSDN]

It is an ambiguous word choice, but they were using "Exercise" in the more common definition.

More importantly is that the question was testing your understanding of hyperventilation, where there is a significant change in pCO2 but not in pO2. I believe you chose the answer on the assumption that hyperventilation would increase pO2 levels, but it won't to a significant degree. That makes 3 answer choices wrong "unconsciousness".

For reference you can read "http://en.wikipedia.org/wiki/Choking_game#Self-induced_hypocapnia" and it explains how hyperventilation can cause unconsciousness (without altering pO2).