Runner Things #1392
Posted on 23 May, 2013
Running a marathon burns 2900 calories or 674 M&Ms. Not that I looked that up.
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The need to breathe so much is due to carbon dioxide build-up more than the need for oxygen. If there was a different way to get rid of carbon dioxide from the blood, we would only need to breathe at a rate of about once per minute.
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