MONICA SCHROEDER / SCIENCE PHOTO LIBRARY MONICA SCHROEDER / SCIENCE PHOTO LIBRARY
Illustration showing the external anatomy of a human heart, seen from the front. The surface blood vessels are the coronary arteries (bright red) and veins (blue), bringing oxygenated blood to the heart and removing deoxygenated blood. This healthy heart has a normal heart rate, depicted by an EKG is in the background.
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