Answer: "electr"
The word part that completes the medical term meaning process of recording the electrical activity of the heart, is electr/o/cardi/o/graphy,
Explanation:
Electrocardiography is the science behind the diagnosis of the heart rhythm and conditions based on the visual presentation of the electrical currents associated with heart muscle activity.
Thus, it helps in understanding and diagnosis of some irregular heart rhythm and abnormalities.
