In ECG, P-wave represents _________.

End of atrial contraction

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Beginning of atrial contraction/depolarisation

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Beginning of ventricular contraction

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None of the above

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Solution

The correct option is D Beginning of atrial contraction/depolarisation
ECG consists of three components: P-wave, a QRS complex, and a T-wave.
The P-wave represents the beginning of the atrial contraction (atrial depolarisation).
The QRS complex represents ventricular contraction (ventricular depolarisation) and T wave represents ventricular relaxation (ventricular repolarisation).

Hence, the correct answer is option B, i.e., Beginning of atrial contraction/depolarisation.

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Similar questions

Which of the following correctly explains a phase/event in the cardiac cycle in a standard electrocardiogram?
(a) QRS complex indicates atrial contraction.
(b) QRS complex indicates ventricular contraction
(c) Time between S and T represents atrial systole.
(d) P-Wave indicates the beginning of ventricular contraction.

Match column I with column II regarding the standard ECG of a normal person.
$\begin{matrix} C o l u m n - I & C o l u m n - I I (a) & P - w a v e & (i) & A t r i a l d e p o l a r i z a t i o n (b) & Q R S w a v e & (i i) & V e n t r i c u l a r d e p o l a r i z a t i o n (c) & T w a v e & (i i i) & V e n t r i c u l a r r e p o l a r i s a t i o n \end{matrix}$

Q. Assertion :In ECG graph of heart, pulse 'R' is the peak point. Reason: It shows the atrial depolarisation which takes 0.2 seconds.

Q. ECG depicts the depolarisation and repolarisation processes during the cardiac cycle. In the ECG of a normal healthy individual one of the following waves is not represented.

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