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  4. 'T' wave in an ECG represents

Q. 'T' wave in an ECG represents

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Solution:

Various waves are observed in a normal ECG:
I. P-wave: It represents the electrical excitation (or depolarization) of the atria, which leads to the contraction of both the atria (atrial systole).
II. QRS complex: It represents the depolarization of the ventricles initiating the ventricular contraction. The starting of ventricular contraction (or beginning of the systole) starts shortly after Q.
III. T-wave: It represents a phase in which the ventricles return from excited to a normal state (repolarisation). The end of the T-wave marks the end of ventricular systole.