P wave of ECG indicates  1. activation of SA node  2. depolarization of atrial muslces
Channel: Doubtnut
Date: 2020-04-26

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