QRS complex of a standard ECG represents

Excitation or depolarisation of atria

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Depolarisation of ventricles

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Repolarisation of ventricles

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None of the above.

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Solution

The correct option is A Depolarisation of ventricles
An ECG shows five consecutive waves: P, Q, R, S and T.
P wave represents depolarisation of atria and leads to contraction of both atria.
QRS complex represents depolarisation of ventricles which leads to initiation of ventricular contraction.
T wave represents return of ventricles from excited to normal state.
So, the correct answer is 'Depolarisation of ventricles'.

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Similar questions

Q. In a standard ECG, QRS complex represents:

Q. The QRS complex in a standard ECG represents:

ECG depicts the depolarisation and repolarisation process during the cardiac cycle. In the ECG of a normal healthy individual one of the following waves is not represented.
(a) Depolarisation of atria
(b) Repolarisation of atria
(c) Depolarisation of ventricles
(d) Repolarisation of ventricles

Q. Match the Column - I with Column - II.

	Column I		Column II
A	P-wave	1	Depolarisation of ventricles
B	QRS complex	2	Repolarisation of ventricles
C	T-wave	3	Coronary ischemia
D	Inversion of T-wave	4	Depolarisation of atria
		5	Repolarisation of atria

In ECG, the depolarisation of atria is indicated by

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