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The Effects of Exercise on the Heart Rate Aim: To discover if there is any link between the amount of exercise taken to the rise of a person's heart rate. Prediction: I believe that when the body is exercising very hard, the heart reaches its maximum heart rate. In a graph it would appear like this: When the maximum heart rate is reached the graph will level off because the heart rate is no longer increasing. When the body is exercising the muscles respire to produce energy, so the muscles can contract. Oxygen is needed for this process; the oxygen is carried in the haemoglobin of the red blood cell. The heart and lungs need to work harder in order to get a greater amount of oxygen to the muscles for respiration. In muscle cells digested food substances are oxidised to release energy. These oxidation reactions are called cellular respiration. When muscles use oxygen...

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