What does the P wave in an EC G represent? Atrial depolarization Ventricular repolarization Ventricular depolarization Atrial repolarization

The correct answer is **Atrial depolarization**.Here's why:* **Electrocardiogram (ECG or EKG):** An ECG is a test that measures the electrical activity of the heart. It records the heart's electrical signals as waves on a graph.* **P Wave:** The P wave represents the electrical activity associated with the **atrial depolarization**. This means it shows the electrical signal that travels through the atria, causing them to contract and pump blood into the ventricles.**Other options:*** **Ventricular repolarization:** This is represented by the T wave.* **Ventricular depolarization:** This is represented by the QRS complex.* **Atrial repolarization:** This is usually too small to be seen on an ECG.