Which term refers to the graphic tracing of the heart's electrical activity?

The term that refers to the graphic tracing of the heart's electrical activity is the electrocardiogram. This diagnostic tool records the electrical signals that trigger each heartbeat, allowing healthcare professionals to assess heart rhythm, rate, and overall cardiac health. It is commonly used to identify various heart conditions such as arrhythmias, heart attacks, and other cardiovascular issues.

The electroencephalogram, in contrast, records electrical activity in the brain and is used to diagnose conditions related to brain function, while the electromyogram assesses muscle activity by measuring electrical signals in muscles. Ultrasound, on the other hand, is an imaging technique that uses sound waves to visualize internal structures, including organs and tissues, but does not record electrical activity.