Answers

2015-11-28T17:04:52+05:30
This is because our heart speeds up to pump extra food and oxygen to the muscles.
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u can provide a bit more explanation on this
no probes
2015-11-28T17:22:32+05:30
When we run our cells require more energy to work,so they need more oxygen which is provided by the blood. To increase oxygen level the blood has to be pumped faster and so our heart beat rate increases

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