Q. The 'P' wave in an ECG indicates
Solution:
Solution:
ECG is Electrocardiogram which shows electrical activity of heart. P wave shows contraction or depolarisation of atria. P wave mark beginning of new cardiac cycle by start of atrial systole that is atrial depolarisation making it contract and pump blood into ventricles. Generally right atria contract earlier due to presence of SA node in right side making it fast for potential to travel to right side then to left side.