The P wave in the ECG indicates

Atrial depolarization

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Rapid ventricular depolarization

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Absolute refractory period

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Repolarization of the ventricles

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Solution

The correct option is C Atrial depolarization
An ECG consists of a set of three waves; these are namely the P wave, a QRS complex, and a T wave. Initiation of impulse by SA nodes and its travel through atria is represented by P wave which in turn signals systole of atria and initiation of contraction of atrial myocardium. This makes option A correct answer. Depolarization of the ventricles followed by excitation of the Purkinje fibers is represented by QRS complex which makes option B incorrect answer. It signals ventricular systole and initiation of contraction of ventricular myocardium. Repolarization of the ventricles is represented by T wave which makes option D incorrect. It signals ventricular diastole and relaxation of ventricular myocardium. The periods from initiation of QRS complex to peak of T wave is referred to as absolute refractory period when cardiac cells do not respond to any stimulus irrespective of it strength. This makes option C incorrect. Correct answer is A.

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Similar questions

Q. In ECG deflection waves, ventricular systole occurs during

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. Ventricular repolarization causes .......... in ECG.

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. State whether the following statements are true or false.
During the refractory period between ventricular contraction and atrial contraction, the heart is in diastole.

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