Question

In ECG, P-wave represents
A) Ventricular repolarization
B) Ventricular depolarization
C) Atrial depolarization
D) Atrial repolarization

Answer 1

Hint:ECG stands for Electrocardiogram, which records the heart signals with the help of electrodes placed on the body of a patient.

Complete answer:
ECG:-
>It records the electrical signal from the heart in order to check heart condition.
>It is a painless test.
>It is a graphical representation showing waves
>Electrodes are placed on the chest of the patient to record his/her heart condition.
>The signals are shown in a monitor or computer attached with the ECG machine.
Waves of ECG:-
The ECG include:
1) P Wave
2) Q Wave
3) S Wave
4) R Wave
5) U Wave
6) T Wave

P- Wave:-
In ECG, the P-Wave represents Atrial depolarization. This Atrial depolarization results in atrial contraction or atrial systole.
Q- Wave:-
In ECG, the Q- Wave represents Ventricular depolarization. The Q Wave is an initially negative deflection of the QRS complex.
S- Wave:-
In ECG, the S-Wave signifies the Ventricular depolarization. The S wave is the first downward deflection of QRS complex occurs after the R wave.
R- Wave:-
In ECG, the R-Wave represents the Ventricular depolarization. It is the first positive wave of the QRS complex.
U- Wave:-
U wave represents the ventricular repolarization. This wave comes after the T wave.
T- Wave:-
T waves represent the ventricular repolarization. The T wave comes after the QRS complex.

Therefore, from the above discussion it is clear that in ECG, the P- wave represents Atrial depolarization.

Hence option “C” is the correct answer.

Note:Remember to keep in mind that there is no distinct wave for atrial repolarization so don’t get confused with it. All the waves in the QRS complex show ventricular depolarization.