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Why might heart rate vary in response to physical activity?

April 26, 2017activity Biology heart Mathematics physical rate Response

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Why might heart rate vary in response to physical activity?

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Heart rates vary by how much work it has to do. If someone is fat, the heart has to work harder. If someone is smaller, the heart doesn’t need to work so hard. If it takes a long time for someone to recover then the oxygen in the blood might not be circulating enough.