Human Heart: Structure and Working · NCERT Biology

The T-wave in an ECG represents the return of the ventricles from excited to normal state. This process is called:

  1. Depolarisation of muscle cells
  2. Repolarisation
  3. Generation of action potential
  4. Double circulation
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Correct answer: Repolarisation

Repolarisation is the process where the electrical state of ventricular muscle cells returns to the resting phase after contraction. The T-wave in an ECG specifically marks the repolarisation of the ventricles.

Difficulty: Medium Question 19 of 20

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