 
 <translate> Reasoning: The relevant information to answer the above question is: The P wave in the ECG represents atrial depolarization, which results in atrial contraction, or atrial systole. <hau> Dalili: Bayanin da ya dace don amsa tambayar da ke sama shi ne: P wave a cikin ECG yana wakiltar depolarization na atrial, wanda ke haifar da raguwar atrial, ko atrial systole. 