MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
Ruptured blood vessel. Computer artwork of an electrocardiogram (ECG) trace (left), a ruptured blood vessel (right) and red blood cells (erythrocytes). Ruptures in a blood vessel may be caused by trauma to, or weakening of the blood vessel's wall. The ECG trace shows the electrical activity of the heart. Contractions are caused by electrical signals between the upper (atrial) and lower (ventricle) chambers. The tall peak indicates the pumping action of the ventricles.
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