Which of the following correctly explains a phase/event in the cardiac cycle in a standard electrocardiogram? (a) QRS complex indicates atrial contraction. (b) QRS complex indicates ventricular contraction (c) Time between S and T represents atrial systole. (d) P-Wave indicates the beginning of ventricular contraction.
Match column I with column II regarding the standard ECG of a normal person. Column−I Column−II(a)P−wave(i)Atrial depolarization(b)QRS wave(ii)Ventricular depolarization(c)T wave(iii)Ventricular repolarisation