Question

lo 3.4. what does the electrocardiogram record?
records your hearts temperature
records your hearts electrical activity
records your hearts blood pressure
records your hearts muscle mass
records your hearts oxygen level

Explanation:

An electrocardiogram (ECG or EKG) is a medical test that measures the electrical activity of the heart. It records the electrical impulses generated by the heart as it contracts and relaxes. This electrical activity is represented as waves on the ECG graph. The other options are incorrect because an ECG does not measure temperature (thermometer or other methods), blood pressure (sphygmomanometer), muscle mass (imaging or other techniques), or oxygen level (pulse oximeter).

Answer:

Records your heart's electrical activity