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Question: Answered & Verified by Expert
In a standard ECG, which one of the following alphabets is the correct representation of the respective activity of the human heart?
BiologyBody Fluids and CirculationNEETNEET 2009 (Screening)
Options:
  • A R-repolarisation of ventricles
  • B S-start of systole
  • C T-end of diastole
  • D P-depolarisation of the atria
Solution:
1319 Upvotes Verified Answer
The correct answer is: P-depolarisation of the atria
In ECG, P-wave indicates impulse of contraction generated by SA-node and it spreads in atria causing atrial depolarisation.
T-wave is the most constant and conspicuous wave having the tallest amplitude. It is the first positive deflection during ventricular depolarisation.
S-wave is the next downward deflection constant but often inconspicuous.
T-wave is repolarisation wave of ventricular relaxation.

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