Electrocardiograms (ECGs) record the activity of the heart through electrodes placed on the patient’s skin.

A portable health monitor
A portable health monitor

Cardiological contraction is caused by changes in electrical potential in the hearts muscle cells; electrical activity that the body conducts to its surface. 

Although it is altered by the intervening tissue, the resulting signal at the skin accurately reflects the cardiological cycle and can be used to identify any anatomical and physiological anomalies in a completely non-invasive manner.


ZIP contains teacher-notes (PDF), Videos (WMV), worksheet (doc) and presentation (ppt). Once downloaded please save all files in a single folder to ensure PowerPoint links work.

Related information

Cookie Settings