MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
Venous system. Computer-enhanced illustration of the venous circulatory system in the human body, shown in a standing figure. A healthy ECG (electrocardiogram) heart trace is superimposed. The ECG shows the healthy beating of the heart as a waveform. Veins seen here carry deoxygenated and used blood back to the heart from the rest of the body. The average adult has about five litres of blood. At rest this volume of blood passes through the heart and around the body each minute. Original figure illustration by Andreas Vesalius from his book: "De Humani Corporis Fabrica" (1543).
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