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Effect of exercise on rate of cardiac cycle

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Effect of exercise on rate of cardiac cycle It is my intention to discover what effect exercise has on the rate of cardiac cycle. Background The heart is arguably one of the most important organs in the human body; its function is to pump blood with enough force it can travel to the lungs, back to the heart and then around the body. The human heart comprises of four chambers, the left and right atrium and the left and right ventricles. To get blood pumping around the body it first enters the right atrium, is pushed into the right ventricle and then pumped to the lungs where it becomes oxygenated. ...read more.


A single heartbeat starts with an electrical signal from a region of specialised tissue called the sino-atrial node, on the wall of the right atrium. This is the heart beat regulator. The electrical signal spreads out over the walls of the atria, causing them to contract. From there, the signal does not pass directly to the ventricles. If it did, the ventricles would contract before they had filled with blood. Instead the impulse is delayed slightly. A second node, the atrio-ventricular node picks up the signal and channels it down the middle of the ventricular septum through the bundle of His. ...read more.


vi. Repeat from step three using the following distances, 75, 100, 150, 175, 200 and 250 meters. Principle This method works on the principle that as the rate of activity increases; specific muscles in the body will be respiring faster due to the fact that they will require more energy. With this increased rate of respiration more oxygen will be required and there will be increased levels of Carbon dioxide being produced. With these altering levels of CO2 the body will require to alter the rate of blood flow as to get more oxygen into the blood quicker, and expel carbon dioxide out of the blood quicker. This means that the speed of blood flow will either have to increase or decrease, this of course being controlled by the heart. Steven Spencer ...read more.

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