A) P-wave
B) Q-wave
C) T-wave
D) ORS complex
Correct Answer: D
Solution :
In an electrocardiogram (ECG) which consist P- wave, T- wave and ORS complex. The depolarisation of atria in ECG is represented by P- wave, which is small upward wave. T- wave (dome-shaped) represent ventricular repolarisation. QRS complex begin after a fraction of second of the P- wave and show a smaller downward deflection (Q) then continued large upward (R) and triangular wave ending as downward wave (S). Ventricular contraction or dipolarisation is represented by ORS complex.
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