What is the purpose of the standard limb lead in ECG? To analyze muscle activity To provide a minimum standard for electrodes To measure blood pressure To record temperature

The correct answer is **To provide a minimum standard for electrodes**. Here's why:* **Standard limb leads** in an electrocardiogram (ECG) are used to create a 12-lead ECG. These leads are placed on the limbs (arms and legs) to record electrical activity of the heart from different angles. * **The purpose of these leads is to standardize the placement of electrodes**, ensuring consistency across different patients and healthcare providers. This standardization allows for accurate interpretation of the ECG.Let's look at why the other options are incorrect:* **To analyze muscle activity:** While muscles do have electrical activity, ECGs are specifically designed to measure the electrical activity of the heart.* **To measure blood pressure:** Blood pressure is measured using a sphygmomanometer, not an ECG.* **To record temperature:** Temperature is measured using a thermometer, not an ECG.