Home Biology Body Fluids and Circulation Cardiac Cycle and ECG The beginning of ventricular systole is repr…
Biology Body Fluids and Circulation Cardiac Cycle and ECG Single Correct MCQ
Published on: August 13, 2026

The beginning of ventricular systole is represented in ECG through

A
P and Q wave
B
QRS wave
C
P and S wave
D
S and T wave

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The correct answer is:
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ECG (Electrocardiogram) represents the electric current that moves through the heart during a heart beat. An ECG shows five consecutive waves i.e. P, Q, R, S and T.

P wave represents the depolarisation of atria when both the atria contract.

QRS complex represents depolarisation of ventricles when ventricular systole i.e. contraction of ventricles occur.

T wave represents ventricular repolarisation when ventricles return from excited state to normal state.

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