Heart Structure What is an electrocardiogram what does an ECG tract show 2.5 / 5 based on 3 ratings ? BiologyCells, tissues and organsGCSE Created by: LauraCreated on: 16-04-10 09:21 What is an electrocardiogram? It monitors the the activity of the Heart. Several electrodes are attached to specific places on a persons chest. These electrodes detect electrical changes in the heart by measuring current at the skins surface. Then the leads are connected to a machine that draws an electrocardiogram (ECG) 1 of 2 Sinoatrial node Generates a wave of signals. That spread through the atria, this causes them to contract simultaneously. The signal then moves to the apex of the heart. This signal then spreads throughout the ventricles. Which triggers the power contraction of the ventricles. Then finally the heart relaxes, the ventricles become re-primed electrically, ready to conduct signals in the next cardiac cycle. 2 of 2
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