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when we exercise our heart beat increases due to the reason that during exercise the body need more oxygen which is carried by blood so more and more blood carrying oxygen is to move to the part for which we are doing exercise and so more of the work heart have to do to pump the blood so ultimately our heart beat increases

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Q: Your heart beat about 70 to 75 times per minutes when you are at rest.Our heart beats increases on decreases when you exercise why.?
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