P wave of ECG indicates 1. activation of SA node 2. depolarization of atrial muslces 3. spread of excitation froom AV node ot Pu

P wave of ECG indicates
1. activation of SA node
2. depolarization of atrial muslces
3. spread of excitation froom AV node ot Purkinje fibres
4. repolarization of atria and depolarization of ventricles
A. 1 and 2 are correct
B. 2 and 4 are correct
C. 1 and 3 are correct
D. 1,2 and 3 are correct

P wave of ECG indicates 1. activation of SA node 2. depolarization of atrial muslces 3. spread of excitation froom AV node ot Purkinje fibres 4. repol

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