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Q.

During the S-T segment of ECG,

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a

atria in a depolarised state while ventricles are in a repolarised state

b

atria are in a repolarised state while ventricles in a depolarised state

c

atria and ventricles are in a depolarised state

d

atria and ventricles are in a repolarised state

answer is B.

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Detailed Solution

S-T segment lies between QRS complex and T wave. QRS complex represents ventricular depolarisation and T wave represents ventricular repolarisation. Atrial repolarisation also occurs during QRS complex. Hence during S-T segment, atria are in a repolarised state while ventricles in a depolarised state.

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