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The QRS complex in a standard ECG represents:
P wave represents depolarisation of atria. QRS complex represents DEPOLARISATION OF VENTRICLES (triggering ventricular contraction/systole). T wave represents repolarisation of ventricles. Mark Depolarisation of ventricles (Option 3) in 5 seconds!
A standard ECG tracing records the electrical changes propagating through the myocardium during a cardiac cycle, consisting of a P wave, a QRS complex, and a T wave.
The QRS complex represents the electrical depolarisation of the ventricles, which initiates the ventricular contraction (ventricular systole shortly after Q).
The P-wave represents the electrical excitation (or depolarisation) of the atria, which leads to atrial contraction. The T-wave represents the return of the ventricles from excited to normal state (repolarisation of ventricles).
By counting the number of QRS complexes that occur in a given time period, one can determine the heart beat rate of an individual.
Diagnose every choice: Know exactly why the right option works and why distractors fail.
Incorrect; atrial repolarisation occurs during ventricular depolarisation and is obscured/masked by the large QRS complex; it is not represented by QRS.
Incorrect; depolarisation of auricles (atria) is represented by the P-wave, not QRS.
Factually exact; the QRS complex marks electrical depolarization spreading rapidly through the ventricular myocardium.
Incorrect; ventricular repolarisation is represented by the T-wave.
P = Atrial Depol. QRS = Ventricular Depol. T = Ventricular Repol. (Auricular repolarization is hidden inside QRS).
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