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NEET2009ZoologyBody Fluids and CirculationActual

In a standard ECG, which one of the following alphabets is the correct representation of the respective activity of the human heart?

Options

  1. AR-repolarisation of ventricles
  2. BS-start of systole
  3. CT-end of diastole
  4. DP-depolarisation of the atria

Correct answer

D. P-depolarisation of the atria

Step-by-step solution

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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