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(B) In a standard $ECG$:- The $P$-wave represents the electrical excitation (or depolarisation) of the atria,which leads to the contraction of both at

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$A-III, B-I, C-IV, D-II$

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(B) In a standard $ECG$:- The $P$-wave represents the electrical excitation (or depolarisation) of the atria,which leads to the contraction of both atria $(A-III)$.- The $Q$-wave marks the beginning of ventricular systole $(B-I)$.- The $QRS$ complex represents the depolarisation of the ventricles,which initiates ventricular contraction $(C-IV)$.- The $T$-wave represents the return of the ventricles from an excited to a normal state (repolarisation) $(D-II)$.Therefore,the correct matching is $A-III, B-I, C-IV, D-II$.

List $I$	List $II$
$A$. $P$-wave	$I$. Beginning of systole
$B$. $Q$-wave	$II$. Repolarisation of ventricles
$C$. $QRS$ complex	$III$. Depolarisation of atria
$D$. $T$-wave	$IV$. Depolarisation of ventricles

Match List $I$ with List $II$.

List $I$ List $II$

$A$. $P$-wave $I$. Beginning of systole

$B$. $Q$-wave $II$. Repolarisation of ventricles

$C$. $QRS$ complex $III$. Depolarisation of atria

$D$. $T$-wave $IV$. Depolarisation of ventricles

Choose the correct answer from the options given below:

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Match List $I$ with List $II$. List $I$ List $II$ $A$. $P$-wave $I$. Beginning of systole $B$. $Q$-wave $II$. Repolarisation of ventricles $C$. $QRS$ complex $III$. Depolarisation of atria $D$. $T$-wave $IV$. Depolarisation of ventricles Choose the correct answer from the options given below: