Question
Question: Which of the following is correct about a standard ECG...
Which of the following is correct about a standard ECG
A
QRS complex indicates ventricular repolarisation
B
T wave indicates ventricular contraction
C
End of T wave denotes end of ventricular systole
D
P wave indicates beginning of ventricular depolarisation
Answer
End of T wave denotes end of ventricular systole
Explanation
Solution
An electrocardiogram (ECG) records the electrical activity of the heart. The different waves and complexes on an ECG correspond to specific events in the cardiac cycle.
- P wave: Atrial depolarization (contraction of atria).
- QRS complex: Ventricular depolarization (contraction of ventricles).
- T wave: Ventricular repolarization (relaxation of ventricles).
The end of the T wave signifies the completion of ventricular repolarization, which means the ventricles are fully relaxed, thus marking the end of ventricular systole.