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In an EKG, what does the QRS wave indicate? electrical signal over the ventricles first heart sound second heart sound electrical signal over the atria

In an EKG, what does the QRS wave indicate? electrical signal over the ventricles first heart sound second heart sound electrical signal over the atria

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In an EKG, what does the QRS wave indicate?
   
electrical signal over the ventricles
   
first heart sound
   
second heart sound
   
electrical signal over the atria
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Introduction:

ECG or EKG stands for electrocardiograph. It is referred to as the graphical representation that measures the electrical activity occurring in the heart at the time of the cardiac cycle. The study of ECG or electrocardiograph helps in detecting any abnormalities or clinical conditions that may be associated with the heart. It helps in diagnosing any disease and abnormal function of the heart. The four waves a present on an ECG. P, Q, R and S. In the condition of arrhythmia, these waves become irregular.

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