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Electrical events in the cardiac cycle
Member rating: No Rating | Words: | Submitted: Tue Mar 02 2004
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Electrical events in the cardiac cycle Normally, the atria and ventricles of the heart alternately contract and relax in a rhythmic fashion. This cycle of contraction and relaxation is controlled by the electrical conduction system of the heart. Therefore the cardiac cycle can be monitored by examining the electrical activity of the heart via an electrocardiogram (ECG). The cardiac cycle results in the rhythmic opening and closing of the valves of the heart. This activity produces heart sounds which also tell much about the functioning of the heart (as seen on a PCG-phonocardiogram). The Sinoatrial node (SAN) is spontaneously auto rhythmic (it contracts of its own accord). Also it is myogenic (has the ability to generate an electrical frequency) The heartbeat is initiated in a specialised area of muscle in the right atrium called the sinoatrial node (SAN) or the pacemaker. The SAN starts the waves of depolarisation, which results in contraction. Although...
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