BILL LONGCORE / SCIENCE PHOTO LIBRARY BILL LONGCORE / SCIENCE PHOTO LIBRARY
Heart disease. Computer-enhanced image of a human heart depicting cardiac disease. Superimposed is an electrocardiograph (ECG) readout showing abnormal heartbeat (at left) and normal heartbeat (at right). As a pump the heart circulates blood around the body. Main arteries and veins which service the heart are visible at top. ECG heart traces measure the pumping of the heart as a series of small and larger waves. These waves correspond to the electrical activity of heart muscle during contraction. This measurement is an important means of diagnosing heart diseases like coronary heart disease, thrombosis, and arrhythmias.
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