What does the electroc :ardiography (ECG) record? Heart rate Body temperature Blood pressure Electrical activity of the heart

The correct answer is **Electrical activity of the heart**. Here's why:* **Electrocardiography (ECG)** is a medical test that measures the electrical activity of the heart. It records the heart's electrical signals as waves on a graph. These waves can help doctors diagnose various heart conditions.Let's look at why the other options are incorrect:* **Heart rate:** While an ECG can be used to determine heart rate, it doesn't directly record it. The ECG measures the electrical signals that cause the heart to beat.* **Body temperature:** Body temperature is measured using a thermometer, not an ECG.* **Blood pressure:** Blood pressure is measured using a sphygmomanometer, not an ECG.