Body Fluids And Circulation Ques 49
49. The QRS complex in a standard ECG represents
(a) Depolarisation of auricles
(b) Depolarisation of ventricles
(c) Repolarisation of ventricles
(d) Repolarisation of auricles
Show Answer
Answer : b
Hints & Solutions
(b) The QRS complex represents the depolarisation of the ventricles, which initiates the ventricular contraction. The contraction starts shortly after Q and marks the beginning of the systole. The term electrocardiogram used to describe these wave forms was first coined by Einthoven at the Dutch Medical Meeting of 1893. In 1901 , he successfully developed a new string galvanometer with very high sensitivity, which he used in his electrocardiograph.
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