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The Effect of Exercise on Heart Rate.

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Introduction

The Effect of Exercise on Heart Rate I am investigating the effect of exercise on heart rate. In this investigation we will be doing different intensities of the same exercise to see what the difference is. The exercise will be to run length of a tennis court. We will run it two times, four times, six times and eight times each. In this investigation I will use a heart rate monitor to measure precisely peoples heart rate after the exercise. I will get the teacher to check my experiment to make sure everything is safe e.g. if people are in any danger when they are doing the experiment. I will make it a fair test by repeating the exercises twice and averaging it. We will get equal rests, to make sure our heart rates are down to normal, in between each run. I will try and do the experiment and the repeat readings in the same temperature because if one of the experiments was in a hotter climate the heart rate would be quicker and that would be unfair. ...read more.

Middle

The pacemaker is called the sinus node. It's a small mass of specialized cells in the top of the heart's right atrium. It makes the electrical impulses that cause your heart to beat. It can control the rate in which it beats as well. The metabolic rate increases. This is caused by the shortage of ATP. The increased metabolic rate results in carbon dioxide building up in muscle tissue. If the level of carbon dioxide builds up then this is monitored by chemoreceptors. This makes adjustments in the ventilation rate because you need more oxygen to replace the carbon dioxide. The heart rate increases to carry the waste away and replace it with oxygen quicker. Rapid movement of limbs stimulates receptors in the skeletal muscles and tendons. These transmit impulses to the heart, leading to a further increase in the heart rate. 1st Results Subject Resting Heart Rate after Exercise Heart Rate 2 Lengths 4 Lengths 6 Lengths 8 Lengths Jack 90 162 180 180 210 Joe 78 162 174 180 192 Stuart 96 168 168 180 ...read more.

Conclusion

ATP releases energy for the muscle cells to work. ATP is composed of three components. At the centre is a sugar molecule (ribose); attached to one side of this is an adenine molecule. On the other side are 3 phosphate molecules. These are the main part to the activity of ATP. ATP works by losing the end phosphate molecule when told to do so by an enzyme. This reaction releases a lot of energy, which organisms can used to contract muscles and other functions. This produces adenosine diphosphate, and then the end phosphate molecule can be removed to release even more energy. The line in the graph is curved because there is a limit to how fast the heart can beat. The blood comes into the atria of the heart from the veins, it then drops into the ventricles and is pumped out and into the arteries, to go around the body. If the heart beats too fast then not enough blood can drop into the ventricles and the blood does not work fully. ...read more.

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