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Introduction The heart rate of a human varies from 150 beats per minute in young children, to about 60 beats per minute in the aged, however I am going to investigate whether my heart rate increases or decreases during physical exercise and why it does this. Prediction From my general knowledge I predict that my respiration rate will increase as a result of physical exercise. To start with I predict that there will be a general increase, but as my body starts to work harder I think that the heart will have to increase to a faster rate. My heart will have to pump more quickly to get the oxygen to my muscles for my body to function correctly. Once I have completed the exercise I think that my heart rate will decrease back to my normal resting pulse rate. I have made these predictions because I believe the supply of oxygen to the...

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