What is Electrocardiogram Draw a standard ECG and explain the different

The graphic representation of the electrical potentials produced by the excitation of

the cardiac muscles is called Electrocardiogram.

ELECTROCARDIOGRAM

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- A normal electrocardiogram has the following waves:

(i) P wave- a small upward wave, that indicates the depolarisation of the atria.

(ii) The QRS complex represents the depolarisation of the ventricles which initiates

the ventricular contraction and repolarisation of atrial simultaneously.

(iii) T wave indicates the repolarisation of ventricles.