What are the different waves in an ECG and how do they contribute to the overall interpretation of the heart's electrical activity?

The different waves in an ECG (electrocardiogram) are the P wave, QRS complex, and T wave. The P wave represents atrial depolarization, the QRS complex represents ventricular depolarization, and the T wave represents ventricular repolarization. These waves help in interpreting the heart's electrical activity by showing the timing and coordination of the heart's chambers contracting and relaxing. Abnormalities in these waves can indicate various heart conditions, helping healthcare providers diagnose and treat heart problems.