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June 30, 2015

Homework Help: Health

Posted by Mary on Thursday, September 9, 2010 at 1:24pm.

A runner completes a more difficult run than usual. At the end, he's breathing heavily and his muscles are cramping. This condition is caused by a buildup of ___ in his blood and muscles.

A. lactic acid
B. oxygen
C. carbon dioxide
D. sulfur

I think it's lactic acid but i want to make sure.

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