BSIP, VERONIQUE ESTIOT / SCIENCE PHOTO LIBRARY BSIP, VERONIQUE ESTIOT / SCIENCE PHOTO LIBRARY
Human heart. Computer illustration of a human heart and its healthy electrocardiogram (ECG) trace. The heart is a hollow muscle that pumps blood around the body. Its main blood vessels can be seen at upper centre. The ECG trace shows the pumping of the heart as a series of waves of various sizes. These waves correspond to the electrical activity that occurs in the heart muscle immediately before it contracts. An ECG is an important heart monitoring technique and can be used to diagnose disease.
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