Which one of the following statements regarding Electrocardiogram is correct?

An Electrocardiogram (ECG or EKG) is a diagnostic medical tool used to record and display the electrical activity of the heart [1]. The heart generates tiny electrical impulses that spread through the heart muscle, causing it to contract; these impulses are detected by electrodes placed on the patient's skin. The resulting graphical representation allows clinicians to monitor heartbeat variations, detect abnormal rhythms, and investigate chest pain [1]. In contrast, the electrical activity of the brain is recorded using an Electroencephalogram (EEG), while the activity of the eyes (cornea) is typically monitored via an Electrooculogram (EOG) [2]. While bioelectrical stimulation can affect tissues like the kidney, the ECG specifically serves as a heart activity monitor [2]. Therefore, the statement that an ECG represents the electrical activity of the heart is the only correct option.

Sources

1. [1] Science-Class VII . NCERT(Revised ed 2025) > Chapter 8: Measurement of Time and Motion > SCIENCE AND SOCIETY > p. 112
2. [2] https://pmc.ncbi.nlm.nih.gov/articles/PMC6642360/