Answer: Repolarisation of ventricles.
- A Depolarisation of atria
- B Depolarisation of ventricles
- C Repolarisation of ventricles
- D Contraction of atria
Correct answer: C. Repolarisation of ventricles
Explanation: The T wave represents the return of the ventricles from an excited to a normal state (repolarisation), which marks the end of systole.
A single ECG cycle: the P wave marks atrial depolarisation (contraction signal), the large QRS complex marks ventricular depolarisation, and the T wave marks ventricular repolarisation (recovery) before the next cycle begins.
Concept context
Blood, lymph, the heart, the cardiac cycle, blood pressure, and ECG. High NEET weightage.