Electrocardiogram - that represents the depolarization of...

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Electrocardiogram Electrical currents generated by the  heart during the cardiac cycle can be  detected on the surface of the body by  the electrodes of an electrocardiograph.  A recording of these currents, called an  electrocardiogram (ECG or EKG),  represents a sum of all the concurrent  action potentials produced by the heart  as detected by the 12 electrodes of the  electrocardiograph. A single cardiac  cycle produces a distinctive wave  pattern, where peaks and valleys are  indicated by the letters P, Q, R, S, and  T (see Figure 1). An interpretation of 
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the major characteristics of the ECG  follows: The P wave is a small wave 
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Unformatted text preview: that represents the depolarization of the atria. During this wave, the muscles of the atria are contracting. The QRS complex is a rapid down-up-down movement. The upward movement produces a tall peak, indicated by R. The QRS complex represents the depolarization of the ventricles. The T wave represents the repolarization of the ventricles. Electrical activity generated by the repolarization of the atria is concealed by the QRS complex. Figure 1. Different periods of the cardiac cycle: (a) electrocardiogram, (b) heart sounds, (c) valves, (d) pressure, and (e) volume of left ventricle....
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Electrocardiogram - that represents the depolarization of...

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