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Question

(C) The $ECG$ (Electrocardiogram) is a graphical representation of the electrical activity of the heart during a cardiac cycle.- The $P$-wave represen

Vedclass · Accepted Answer

Atrial depolarisation

Vedclass · Answer

(C) The $ECG$ (Electrocardiogram) is a graphical representation of the electrical activity of the heart during a cardiac cycle.- The $P$-wave represents the electrical excitation (or depolarisation) of the atria,which leads to the contraction of both the atria.- The $QRS$ complex represents the depolarisation of the ventricles,which initiates the ventricular contraction.- The $T$-wave represents the return of the ventricles from an excited to a normal state (repolarisation).Therefore,the $P$-wave represents atrial depolarisation.

Column $-I$	Column $-II$
$(a) \; P-$wave	$(i) \; \text{Depolarisation of ventricles}$
$(b) \; QRS$ complex	$(ii) \; \text{Repolarisation of ventricles}$
$(c) \; T-$wave	$(iii) \; \text{Coronary ischemia}$
$(d) \; \text{Reduction in the size of } T-$wave	$(iv) \; \text{Depolarisation of atria}$
	$(v) \; \text{Repolarisation of atria}$

In $ECG$,$P$-wave represents

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