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Investigation-How exercise affects heart rate PLAN Aim- To investigate the effects of exercise on our heart rate Prediction- I predict that the more intense the exercise we do, the higher our heart rate will become. This is because the muscles use the oxygen quicker and so the heart has to pump the blood containing the oxygen quicker as well. Because the exercise I am doing is aerobic, I expect that my heart rate will be directly proportional to the rate of exercise. If the exercise were anaerobic, I would not expect this. Here is my predicted graph to show this: Heart Rate Direct Proportion Rate of Exercise My heart rate will increase because we need energy to exercise. Respiration releases ATP for this. As we need oxygen from the blood for respiration, the heart needs to pump blood to the muscles. As I increase my rate of exercise, this process will...

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