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According to what you have learned about the circulatory and respiratory systems, explain how and why your heart changed its rate.
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According to what you have learned about the circulatory and respiratory systems, explain how and why your heart changed its rate.

User Mani Murugan
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your heart rate changes because when you workout specifically your heart rate will increase because your muscles need more oxygen.when you are resting your muscles don’t require as much oxygen so your heart doesn’t need to pump as fast
User Theorder
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