(Answered) A nine year-old boy decided to find out how long he could

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Question: A nine year-old boy decided to find out how long he could breathe into and out of a paper bag. After ~2 minutes his friends noticed that he was breathing very rapidly and forced him to stop. Which of the following was the most potent stimulus for the boy's hyperventilation?
A.Decreased arterial PO2
B.Increased arterial PO2
C.Increased arterial PCO2
D.Decreased arterial PCO2
E.Increased pH

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