Which term is used to describe the device that records the heart's electrical impulses?

• A. Tissue
• B. Tricuspid Valve
• C. Electrocardiogram (EKG)
• D. Blood Pressure

Answer: (C)

An electrocardiogram records the heart’s electrical impulses. By placing electrodes on the skin, it detects voltage changes as cardiac cells fire in sequence, reflecting atrial depolarization, ventricular depolarization, and repolarization. The resulting tracing shows waves and intervals that reveal heart rate, rhythm, and conduction issues, helping spot arrhythmias, blocks, or signs of ischemia. The other terms don’t fit because they refer to a tissue, a heart valve, or a measurement of blood pressure, none of which are devices that record electrical activity.