zoe4agklAlycute
zoe4agklAlycute
28-01-2017
Health
contestada
Why do you get tired when you run??
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johnyj123
johnyj123
28-01-2017
Because the more someone exerts themselves the more oxygen and carbon dioxide out put ratio is greater. The more you run and the faster you run the more oxygen you loose which is supplied to your muscles including your lungs.
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nellynelle
nellynelle
28-01-2017
After a while our leg muscles do not get enough oxygen.
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